This book is different than the other books in the series. It does not really teach gunsmithing, instead it provides information that would otherwise be scattered far and wide. Seldom in gunsmithing books does anyone explain tools, its simply assumed that the reader already has a pretty high level of experience or training.
This new book is a primer in the truest sense of the term. In concise yet complete and illustrated form the author explains what the tools were designed to do and how to utilize them correctly. If you think this book is for beginners, that is only a small part of its value. Most of the tool makers in the American gunsmithing market participated in the assembly of the primer. Many gunsmiths learn from the school of hard knocks, that is unnecessary when a clear and concise instruction manual is available.
Kindle E book version of the Primer is available on Amazon.com . You old timers probably just yawned, but the tech savvy smiths in the audience perked up. We are told this is the only book in the series that is planned to be offered in eBook format. Why? The Gunsmithing Student Handbook Series is written for college level learning, the material is presented to aid gunsmithing students of all persuasions and experience to become competent and fluent in the language, tools and practice of gunsmithing. So, the Primer will act as an ambassador for the series, the publisher is working with the companies the contributed to the book so that they can offer the eBook or print edition to their clients.
UPDATE: The ebook is also available direct from 4Drentals.com @: https://4drentals.com/product/ebook-primer
4D Reamer Rentals LTD gave us a coupon code for our readers, use this get you free copy of the ebook from the address above. This coupon code is good for a limited time: GTWP7
Reference charts and tables included in the book might make it worth buying all by themselves.
Our friends over a 4D Reamer Rentals LTD have come up with a free app, yes its yours to use with no strings attached, none at all.
This app does what apps do best, provide a simple way to get the information you need and have it handy on your device/phone at all times. Right now it’s available only for Android.
The GaugeGuide App has now be banned by both Google Play and Amazon App Store. Down load it just to piss off the anti-gunners… LOL
Two search methods are provided for the user. Results that are displayed are for cartridges that include the information you entered, so it matters what you type in. It’s true, many gauges are able to correctly headspace more than one cartridge. Knowing which ones is valuable information for the gunsmith. From the search results select the result that is closest to your desired caliber, each result will show the gauges that are fully interchangeable with that result. If you do not see what you are looking for check the other options that appear in the result. If no result appears, it is likely that your caliber of choice does not interchange with any other caliber, I.E. it has caliber specific gauges.
Many gauges will have “details” (information) available that should be helpful in selecting the correct gauges for your desired use.
With either search method when your receive “Compatible Results” similar to the screen shot below:
The list of Gauges that Interchange is as complete as we have every seen.
Note that the list of “Gauges that Interchange” is a comma separated, continuous list. All calibers listed are interchangeable with the cartridge you searched.
The RENT or BUY buttons are used to place an order for the tools, if you need them. You will be sent to the 4Drentals.com web site where you can order the tools you need. The app can be found on Aptoid, Click Here to see the page.
Search as much as you like, its free and informative! Don’t take someones best guess what gauges you need, use a real data base that will tell you the truth and keep you safe.
How many authors can brag that they held #1 in two categories on Amazon.com?
I don’t know the answer to that, but I am one of them so here I am, bragging.
Last month (April 2018) Gordy Gritters and I (Fred Zeglin) released our new book, “Chambering Rifles for Accuracy”. This book is the 3rd in the Gunsmithing Student Handbook Series. Obviously the reception of the book and it’s counterparts in the series has been very good. It’s gratifying to see our work appreciated by so many customers.
On behalf of Gordy and myself.
Thank you for pushing us to #1 on Amazon during the first week of April.
The first book in the new series of Gunsmithing Student manuals is Chambering for Ackley Cartridges. Fred Zeglin the author says, “I have been teaching gunsmithing for some time and with my experience in wildcat cartridges and dealing with clients it became painfully obvious to me that that material available to reloader, gunsmiths and the like are spread far and wide and do not tell the complete story of the mechanics of headspace in firearms.”
Zeglin went on the talk about the fact that Ackley Improved cartidges seem to receive the most mishandling both in the gunsmith trade and by reloaders who do not understand the simple headpsace method that P.O. Ackley set up very early in his career.
Ackley was no fool, he set up a method that is easy to use and will produce both safe and accurate fire-forming of ammunition. There have probably been hundreds of articles written that tout the value of the Ackley Improved principle that allows the firing of factory ammunition for the parent case in the chamber of an Ackley Improved rifle. Unfortunately, many folks refuse to read Ackley’s simple instructions so they end up trying to set headspace without proper understanding of the process. Both professional and hobby gunsmiths are guilty of this.
Prove it you say… OK, call any die maker and ask them for dies for an Ackley Improved cartridge. They will ask you for a chamber or reamer print before they ship the dies. Quality Cartridge is a maker of custom head stamped brass. The owner Pete tells me he will not ship brass for Ackley designs unless he has fired cases from the clients gun, this is simply because of poor headspacing by gunsmiths, or the reloader who does not understand how his dies are adjustable.
In this booklet that kicks off the new series of gunsmithing instruction books, Zeglin clearly and without mincing words tells the reader how to correctly headspace any Ackley Cartridge. It’s not a book about how to ream a chamber but rather about the finesse that should be applied during the process to insure accuracy and longevity of the firearm.
There is a book on how to ream a chamber that will be out in 2018. That title is the third book in this series and Zeglin invited well known Bench Rest Gunsmith Gordy Gritters to co-author that book with him. That will be the book you need you want to understand what it takes to make a rifle shoot, you know we all want those tiny little groups! Watch for a follow up about that book here in the future.
The second title in the series is coming out now as well, it is called, “Understanding Headspace for Firearms” Where the first title is narrowly focused on Ackley designs this title will help the reloader and/or gunsmithing student to understand headspace no matter what firearm you are looking at.
Zeglin is pretty easy going about his work and tells us he fully expects to hear criticism over anything that was not covered thoroughly enough or heaven forbid, missed all together. He says he expects to start the second edition for these manuals as questions start to roll in.
AGI Tech Services Manager and Editor, GunTech Magazine
One of the questions I have most often fielded from AGI students and prospective students over the last several years is; “When are you folks going to do a comprehensive reloading course?”
Well, the stars finally aligned and we convinced Fred Zeglin to take the few weeks he had off between the courses he was instructing and his latest writing projects to use his impressive knowledge of reloading and cartridge design to teach this course.
Fred has an extensive background as a professional custom gunsmith, cartridge designer, and author. His books Wildcat Cartridges, Hawk Cartridges, and his AGI instructional video course, Taming the Wildcat are well worth studying by students of the subjects.
This new course is almost eight full hours of the information any reloader needs to know. As he says in the introduction, “There is something for everyone here. If you’ve never handloaded, everything you need to know to assemble safe, effective handloads is here. If you’ve loaded for years, odds are you will still find out things you never knew, considered, or completely understood.” Let’s take a look at what’s actually under the hood . . .
Disk 1 – Brief History of Reloading: This is no exhaustive history of every step in the evolution of loading firearms and cartridges, but rather a concise explanation of how we got to what we actually do today.
Reloading Components: Here Fred shows the various types of cartridge cases, bullets, primers, and powders. He explains their differences and the reasons why those differences exist. Why are spritzer bullets pointed?
Why are some powders shaped like little rods?
Ignition Theory: What happens from the moment the firing pin strikes the primer to the exit of the bullet from the barrel is carefully explained and shown in drawings.
Pressure Curves: A PressureTrace Internal Ballistics System is used to show the real-time gas pressure rise and fall from primer ignition until the bullet leaves the barrel, approximately 1.5 milliseconds. Fred draws curves
which demonstrate what the pressure curves would look like in the Fred Zeglin, Cartridge Designer
case of a dramatic overload, high pressure caused by an over-length case, and powder detonation which can
occur if a very small charge of slow burning powder is used in a large case.
Resource Books: Fred explains why the Cartridge Comparison Guide belongs in your library as well as other books
that give you information on a huge number of cartridge’s dimensions, shapes, ballistics, and terminal performance. The reference books discussed will help you decide what cartridge you might want in your next gun.
Reloading Manuals: Reloading without these “must have” sources is like driving with your eyes shut, a real recipe for disaster. You need more than one so you can cross reference loading data to make sure the load you are
contemplating is safe.
Disk 2 – Developing a load plan: What IS a loading plan and why do you need one? Have you
decided what the load you’re thinking about creating is supposed to accomplish? Do you have a purpose for loading it? What is it? Is it reasonable?
Selecting correct components for your load plan.
He explains to you why you shouldn’t be “That guy” who just searches for the hottest published load for his cartridge and doesn’t “Waste time” with Starting Loads. “Hey, if it’s published it’s safe, right? These guys always leave a safety
margin, right?” Why you need to keep a complete notebook recording loads, velocity, accuracy, etc.
The Bench: Where should it be, how should it be constructed, how sturdy does it have to be, how high should it be, and why. Press and Die Set-up: Learn how to properly set up the dies, shell holders, and decapping pins from a two die set in your press.
Prepping the Brass: Cleaning, Reaming Inspection: Why you need to clean and inspect your brass, chamfer ream the case mouth and clean out the primer pockets.
PressureTrace Internal Ballistics System
What’s in a “Complete loading kit?” Fred opens a big box from Hornady that contains everything you need to load quality ammo, other than cases, primers, bullets, and powder. Why these make sense for the beginner.
Lubrication: Fred shows you several different methods and products to lubricate the cases prior to resizing, and
why you need to do it.
Full-Length Sizing Dies vs Neck Sizing Dies: Ever wonder what the hoopla about neck sizing from accuracy buffs is all
about? Fred explains why you might want to do it, what makes you able to do it continuously with some cases, why you’ll have to eventually full-length size, and how to avoid “Over-sizing.” Do you know what guns you should not only
never neck-size for, and moreover why you’ll need a “Small base” die? What IS a small base die?
Sizing the Cases: By this time, you will be all set to make those cases like new again.
Priming the Cases: Fred shows you four different priming methods, and why some are better than others in his opinion.
Measuring the powder: Several different scales are shown and how to set them up. After that Fred dips, throws, trickles, weighs, and finally stands and watches a machine do it all.
Disk 3 – Charging Cases: Now we actually begin to load cartridges. Attach the powder measure to the press, verify it is throwing the correct weight, adjust the die so the case is just partially re-sized, and dump the powder into the case. Watch Fred set-up the bullet seating die for no crimp, set the bullet on the top of the case and feed it into the die, adjust its seating depth, and . . . voila!! A real live reloaded round of ammunition made by your very own self.
Seating Bullets with a Crimp: Here you will learn how to set the seating die so it will crimp the case mouth into the bullet’s cannelure just as the bullet reaches the correct depth, and why and when you sometimes need to do this.
Using the Lee Loader: Robart Schaefer demonstrates the use of the basic Lee Loader. Many of we “Senior” reloaders started with one of these tools. It gives you everything you need to load one caliber of good quality ammo for ~ $28. Just supply brass, bullets, primers, and powder. The box holding the tools will fit in the back pocket of your jeans, assuming you don’t fill them as full as some of us.
Fred at the bench demonstrating proper die set up
Next up is Robart Schaefer again, this time with the Lee Hand Press. This is basically a bench type press that
you can use sitting in your La-Z-Boy while watching football. And I have. While it won’t full length resize large
cases, it will do everything else. I probably used it more than anything else with a Lee decapping die, got
my youngest to do a bunch too, and then primed those cases with a Lee Auto Prime. Yep, thousands of them. Got them both for under $50 more than a couple of years ago.
Reloading Cartridges with a Three Die Set-up: Fred explains the use of three die sets. The third die is used to bell the mouth of straight wall cases and pour the powder charge through into the case.
Annealing Brass: Working (sizing) makes it hard and susceptible to cracking. Heating it softens it again and allows more loadings. Fred shows how to do this and gives several alternatives and cautions.
Case Trimming: Here’s where you learn how to trim those over length cases back to the correct size with a couple of different tools and ways of measuring.
Additional Case Prep Procedures: Learn about vibrating, tumbling, and ultra-sonic case cleaners. Learn how and why we uniform primer pockets and flash holes.
Reloading Cartridges Using a Progressive Press: Fred demonstrates a progressive loading press, and describes what happens, and how, at each station.
Disk 4 – Tools and Accessories: Fred wraps up the cartridge reloading portion with a “Show and Tell” of some specialty tools that will make your reloading easier. Shown are extended shell holders to ease the loading of really short cases, a competition shell holder set whose heights vary by .002 inches to allow you to set the exact amount of case sizing you want, powder measure baffle and drop tube, and neck lubers for neck sizing. Specialty dies include neck sizing dies with interchangeable bushings to adjust neck tension, Lee Factory Crimp dies, in-line feeding and micrometer seating
dies, and bullet pulling dies. An impact bullet puller is demonstrated as well.
Bullet Casting: Robart tells us why we should consider casting our own lead bullets and shows what tools and equipment are needed for the process.
Lead: What kinds of lead alloys are needed, where to scrounge what you need, or buy it pure or ready alloyed
if all else fails. The characteristics of the various alloys are discussed and their uses explained.
Pouring Ingots: How and where to heat your lead safely, why and how to flux, and cleaning the dross off the top. It’s kind of cool to see the steel wheel weight clips floating on top of the lead. How to pour the cleaned and alloyed lead into
smaller, easily handled ingots . . . into what looks like corn cob shapes in a jello mold. Why you can never have water around hot lead.
Casting Bullets: Now we get down to actually pouring lead into the molds. How to tell by looking at the bullets whether the lead, mold, or ladle is too hot or cold. He pours from a ladle into the top of single and double molds, and from the bottom into a six bullet mold.
Testing Hardness: Here is a tool the tests the Brinell hardness of the cast bullets and explains how you can determine how hard they have to be based on the chamber pressure of the cartridge they are going to be fired from.
Sizing and Lubing Bullets: Why cast bullets need to be sized and lubed after casting, and how it’s done. What to use for bullet lubes is a choice made based on the bullet’s expected velocity The Lube Sizer Press: This press has a heating
element that heats the lube before it deposits in the lube grooves, seats a gas check, and sizes the bullet, all in one
smooth stroke of the handle.
Final Thoughts on Bullet Casting: Robart wraps up his discussion of bullet casting with a reiteration of why it’s a cool thing to do, and repeats the cautions earlier expressed. Have fun and be safe!
Epilogue: Fred closes by showing a bullet neck concentricity gauge and explains what it tells you and why it is important as a lead-in to a discussion of why learning even more advanced techniques can improve your abilities as a reloader and shooter. If you have never reloaded a single cartridge, you can do so with success and confidence after watching this video course. You will also be able to make informed choices on what tools and equipment will fit your needs and budget.
As a bonus, AGI put Darrel Holland’s Advanced Reloading Techniques course in the package too!
One item this and most of the discussions seem to overlook is headspace. Since this blog leans more toward gunsmithing subjects, I wanted make sure this subject was discussed. I often hear from clients that the 5.56 and the 223 differ in headspace. The truth is, when I checked the various gauge makers they are all working to the same standard.
Why is this important?
Mainly because educating the shooting public minimizes accidents and makes life easier for all concerned. None of the articles I looked at mentioned headspace. Most of the chamber dimensions being shared do not include headspace dimensions. This may be in part because they are so hard to locate for the 5.56 Nato.
Forster Products publishes the data for their 5.56 gauges. Minimum headspace (Go gauge) is 1.4636” according to their specifications with a tolerance of -.0003”. With the Maximum (Field gauge) measuring 1.4736”; that’s 10/1000s of an inch longer than the go gauge. Most No-go gauges would be set .004” to .006” longer than the Go gauge. The Pacific Tool & Gauge print shown here uses a Go gauge that measures 1.4636”.
Look at the Minimum Headspace dimension listed on this print, it is identical to the dimension used on the 223 Remington.
SAAMI specifications for the 223 Remington show a Minimum headspace (Go gauge) of 1.4636” identical to the military spec for the 5.56×45. The Nato round is not a SAAMI cartridge, so they do not provide prints or specification for it.
My curiosity as to why so many shooters think there is a difference between the gauges for these two, led me to do an Internet search to see what people are reading. I consider all material on the Internet to be of dubious quality until I can confirm the data through trustworthy sources. What I found was interesting; you have to dig deep to find anything that pertains to headspace and the 5.56 Nato.
What is easy to locate are drawings which purport to show why the two cartridges are not the same. The dimensions they are concerned with mostly have to do with the junction of the body and shoulder plus the shoulder and neck. In the real world the camming action of the bolt closing would be more than sufficient to deal with the tiny difference that might exist in the brass. Frankly there is more variation in tolerances allowed than these drawings account for, in short, it’s all smoke and mirrors.
Digging a little deeper, I found a couple of sources that state the Military gauge is .001” longer than is found in the prints mentioned above. Even if that were the case, that is only 1/5th of the difference between a standard Go and No-go gauge for the 223 Remington. To be totally clear, it would make NO difference.
There is a logical reason for commercial gauge makers to set the “Miniumum” or “Go” gauge at 1.4636″. MIL-C-70599A(AR) 20 January 1994 MILITARY SPECIFICATION, CARBINE, 5.56MM: M4 reads on page 9: 3.4.1 Headspace. The headspace shall not be less than 1.4646 inches nor more than 1.4706 inches when measured to the .330 inch datum diameter on the first shoulder of the chamber. Logically, if your are making gauges; by setting the gauges at 1.4636″ you guaranty that headspace will never be less than 1.4643″ without a guerilla being involved in the assembly process. Plus, we all know that semi-auto and full auto guns prefer a little more room to function. At the same time it is within allowed military specifications, a Win, Win! To be totally clear, it would make NO difference.
Here is a clip from the Forster write-up on NATO headspace:Conclusion: Headspace gauges for the 223 Remington and the 5.56 Nato are identical. The differences between the cartridges has to do with case wall thickness and how they are loaded. If you want to shoot either type of ammo in your gun, rechamber it to 223 Wylde. The Wylde chamber is designed to work safely with both types of ammo.
Military armorers for field grade weapons utilize only the 5.56 Maximum gauge. Why? Because all that matters in the military is that the gun is safe to fire and functional. So, if you use 223 Remington gauges you will ALWAYS be under the Military Maximum.
Note: this post is only about headspace, we are not addressing the differences in pressure from various ammo. This is covered in the LuckyGunner post linked at the beginning of this post. My buddy over at Ultimate Reloader put out his own discussion of this subject as well, you can watch it below:
During the first day of SHOT Show 2015 I swung by Nosler’s Booth.
And what to my wundering eyes did appear, the 28 Nosler. That’s right Nosler is adding to their line-up. The 28 and 26 Nosler utilize the same headspace gauges.
Talking to Mike Lake, who did the design work on these cartridges for Nosler, he stated that everything from 26 to 9.3mm have been registered and approved by SAAMI. For now, Nosler is only bringing the 28 Nosler to market.
When asked why Nosler took all the designs to SAMMI now Mike said, “We were aware of the wildcats that have appeared on the 26 Nosler case. So, it just made sense for us to get the dimensions for all the calibers completed and registered with SAAMI.”
The 28 Nosler according to Nosler’s new catalog will push a 160 grain bullet at 3300 feet per second (fps). A 175 grain bullet will launch at 3125 fps. In case you were wondering that is faster than the 7mm RUM with less powder. How is that possible? Pretty simple really, the 7mm RUM is very over bore, in other words it has too much case capacity for the 7mm bore.
Last years introduction of the 26 Nosler was met with great enthusiasm by shooters. There is every reason to believe that even more shooters will like the 28 Nosler, 7mm cartridges in general are more popular the 6.5mm in the U.S. Look for this to be a much discussed cartridge in 2015.
I talked to Pacific Tool & Gauge and 4D Reamer Rentals LTD. PTG says the 28 is in production already and 4D placed an order for it as soon as the cartridge was announced. 4D also ordered reamers for all the Nosler designs registered with SAAMI.
Shot Show is just a few weeks away, Fred Zeglin of 4D Reamer Rentals LTD heads to Shot each year to make sure he has all the new caliber offerings for his clients. Last year is was the 26 Nosler and the 25-45 Sharps (SRC).
So far the information leaks about new cartridges for 2015 have been controlled, no sneak peaks at what is coming from the factories. However, Fred says there are new wildcats getting some attention.
6mm Creedmoor has already been added to 4D’s list of reamers you can rent. It looks like wildcats on the 26 Nosler case are what will be hot in 2015. Those calibers will include:
25 Nosler
27 Nosler
28 Nosler
30 Nosler
33 Nosler
35 Nosler
375 Nosler
416 Nosler
All of these wildcats based on the 26 Nosler case will use the same headspace gauges, they are simply necked up, or in the case of the 25 necked down versions of the parent case.
6mm Grendel and 6.8mm Grendel are making waves too. Both of these are based on the popular 6.5 Grendel. If you’re a bolt action fan these cartridge are available in a configuration better suited to a bolt gun as the BPC (Borden Palmisano Cartridge) series, all using the same gauges.
Look for 4D Reamer Rentals to add all these reamers and more in 2015.
Flathead Valley Community College will launch a new two-semester evening Firearms Technologies Certificate starting this fall. The 27-credit program will feature curriculum developed to support the growing firearms industry in the Flathead Valley in Montana as well as across the country.
One of only a few colleges in the nation to offer firearms related programs. FVCC has taken a unique approach, developing the program as an enhancement to its existing industrial machine technology program introduced last year under the Department of Labor “Amplifying Montana’s Advanced Manufacturing and Innovation Industry” grant (#TC-23760-12-60-A-30). This approach will make FVCC the only school that focuses on manufacture of firearms and related parts.
The new program will provide students the opportunity to incorporate advanced machining skills with an understanding of firearms operational systems. Courses are tailored to emphasize the manufacturing of firearm components.
Fred Zeglin, curriculum coordinator for the program, developed the courses under the guidance and input from local firearms manufacturers. “Manufacturers say they are seeking trained machinists who understand firearms. Classes have been designed to build understanding of a wide variety of firearms and the way that they function.” said Zeglin.
Emphasis will be placed upon the completion of several gunsmithing projects involving blueprints and schematics using a combination of both hand and machine tools. This program will provide a clear understanding of firearms design and function, enabling graduates to assist with design implementation or tolerance issues in manufacturing environments.
The program will be held in the evenings with labs during the daytime on Friday and Saturday. Course topics will include firearms introduction and safety; manual mill and lathe systems; bench metal techniques; firearms theory and firearms repair; machine tools for gunsmiths; and precision rifle building. This selection of courses are designed to increase the marketable skills of the students in the manufacturing realm.
The program will be marketed nationwide bringing focus to the local industry. Prospective students must apply both to the program and for admission to FVCC. Program applications are due August 1 at 4 p.m. Applications are available online at http://www.fvcc.edu/firearms or in the Admissions Office in Blake Hall on the FVCC Kalispell campus. For more information, contact Jori Bullemer at 756-3905 or jbullemer@fvcc.edu or Will Richards at 756-4862 or wrichards@fvcc.edu.
Flathead Valley Community College is hosting the NRA Short Term Gunsmithing Program again this summer. 2014 will be the third year for this program at FVCC, the program has grown in attendance each year and this year should be no different. New classes are being offered so if you attended or looked at the offerings in the past there is probably something new for you this year.
Quality instruction is the name of the game at FVCC. The instructors for the Short Term Program are all top notch professionals who are well respected in the gunsmithing community. For instance, Lee Helgeland is one of the premier stockmakers in the nation. He has spent 30 years perfecting his craft and is a member of the American Custom Gunmakers Guild. Another instructor new to the Kalispell program this year, Sam Hatfield, certified NRA and Sig Academy Master Instructor. Sam was head gunsmith at Green Mountain Guns in Lakewood, Colorado and served as a member of the United States Army Marksmanship Unit as a gunsmith. Sam now owns Hatfields Gunsmithing Inc. in Manassas, VA.
To learn more about the instructors for this summers program check out this link:
New classes this year include “S&W Revolver Action Work”, “1911 Handgun AMU Accuracy Rebuilding” and “Accurate Reloading for the Hunter”. Perennial favorites like “Customizing AR-15 or AR-10” and “Introduction to Checkering” will still be on the schedule.
If you have ever wanted to learn more about gunsmithing but can’t take of the two years necessary for most schools, the NRA Short Term Gunsmithing Program is a great alternative. Classes normally run or one week, Monday through Friday. They are intensive hands on classes with small numbers of students, so you have great access to the instructor. This unique learning opportunity is set up as part of the Continuing Education Department of the College and the courses are non-credit.
If cost is a concern I noticed that the College has some Scholarships provided by NRA donations, details at this link:
The second title in the series is coming out now as well, it is called, “Understanding Headspace for Firearms” Where the first title is narrowly focused on Ackley designs this title will help the reloader and/or gunsmithing student to understand headspace no matter what firearm you are looking at.
Conclusion: Headspace gauges for the 223 Remington and the 5.56 Nato are identical. The differences between the cartridges has to do with case wall thickness and how they are loaded. If you want to shoot either type of ammo in your gun, rechamber it to 223 Wylde. The Wylde chamber is designed to work safely with both types of ammo.
GunsmithTalk 