Tag Archives: gauge

Headspace Gauge Interchangeability App is Here!

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.

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:

GaugeGuide App Screen Shot

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 Google Play, 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.

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Filed under Ackley, Firearms, Gunsmithing, How To, tools, wildcat

8×57 (8mm Mauser) Headspace Gage

Here is one of those little things that can make life as a gunsmith tough.  A SAAMI drawing from 11/12/1938 shows a shoulder angle of 20 degrees and 48 minutes.  There is a later revision in 1947 that retains that 20 degree angle. Jump forward in time to4/21/1980 and SAAMI issued a drawing with a 19 degree shoulder.  Its less than two degrees so what is the big deal?  Well the problem is the differnce in angle will cause confusion if not understood.  The 19 degree gage, if used in an old style chamber will contact at the junction of the neck and shoulder, thus causing the headpace to appear tight, or tighter than it really is. You can chamber cast to see which chamber you have if need be.   Is this a big deal?  Not really, just one of those things that forces the gunsmith to check more details.  You might have to check your gages because most are not marked as to shoulder angle.

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Filed under accuracy, ammo, Firearms, Gunsmithing, Rifles, tools