Our friends at 4D Reamer Rental LTD. are now offering rechambering for single shot rifles with break actions. In other words if the barrel comes off, then they will work on it.
The staff at 4D tells me this all grew out of the Savage pre-fit barrels they are selling. They custom chamber these barrels for clients in any caliber that they have tools for, and boy do they have tools, well over 600 chamber reamers on hand. Fred said, “We have no desire to hold an FFL so we will not accept actions in the shop, only barrels. We can rechamber them to any cartridge that is appropriate for the barrel in question. Of course we respect the pressure limits of various actions and will not put a cartridge in a barrel that cannot handle it. Accuracy is normally as good as it was originally and in many cases it’s better because we are careful about proper set-ups and tool alignment.”
Things to consider when thinking about rechambering a single shot barrel.
1. The bore diameter must be the same for the new cartridge as it was with the original, unless you are willing to rebore the barrel as well. (Reboring is cheap).
2. You must pick a chamber that is larger than the original chamber, ideally, larger in diameter and at least a little longer. Sometimes the original neck diameter was on the large size in the factory chamber and when you rechamber it leaves a small groove or mark in the neck area. Normally this is not a problem for function, but it leaves marks on your brass.
3. Ackley Improved cartridges do now work well for single shot rechambers unless your starting from a much smaller case, like a 22 Hornet to a 22-250 AI. This is because of how they are headspaced.
4. If you working with rimmed cases then an Ackley design is fine in a single shot simply because the rim handles headspace.
5. The twist rate of the original barrel should be compatible with the bullet you will likely be shooting in the new chamber.
For ideas on rechambering options see this page at 4D that offers suggestions.
Almost forgot, they can rechamber your Savage barrel too.
Contact them at www.4-dproducts.com or call 406-752-2520
Monday through Friday, 9-5, Mountain time. Of course you can Email anytime.
4D Reamer Rental LTD. has expanded what they offer for shooters and gunsmiths once again. Not only do they offer Savage pre-fit barrels in most any caliber, or twist. They also stock a small supply of barrels on the shelf. See: https://4drentals.com/savage-drop-in-barrels/
Here is what’s really new:
Recently, they started a new offering of chamber work. 4D will rechamber your barrel for Savage barrels as well as many single shots, like NEF rifles, TC Contender or Encore barrels, Rossi single shot rifles can all be reworked to new larger chambers. If you have some other barrel be sure to check in before you ship it. 4D will be glad to answer your questions about this service option. They will not accept a complete firearm, this is barrel work only. For $99 they will rechamber your barrel.
If you have always wanted to try out an Ackley chambering, or wanted a caliber the factory does not offer then this service is right up your alley. With over 1100 reamers on the shelf it’s likely that 4D will have a chambering that will interest you. The gunsmith doing this work for 4D has over 30 years of experience in chambering and barrel work, so you know the work will be done right, no guessing. For the complete list of calibers go to the 4D web site.
Barrels in both Blue and Stainless material are available if your placing an order. Custom orders take more time than barrels on the shelf.
Fred at 4D tells us that this service came about because they often get calls from folks who want to rechamber a gun but do not have any experience with chambering barrels. So it seemed natural to help out such potential clients who were either short on time, or worried about the process. “We offer more chamberings than any other Savage barrel vendor out there, and we can extend that to the single shot barrel market too.”
The barrel blanks offered by 4D are made by three makers, McGowen, Green Mountain, and XCaliber. Delivery times vary by maker, and prices vary a little as well so check in with them for a quote. hours are 9-4 Mountain time, Monday to Friday.
Can you rechamber my NEF or TC Encore…?
The real question often should be can my 308 barrel be rechamber to 338-06? Or some 30-06 Ackley Improved etc.
First when you thinking about rechambering a barrel the bore diameter must be the same unless you are willing to rebore the barrel as well. Reboring is often thought of as a cheap alternative to a new barrel. It is usually less expensive but the best reason for a rebore is when you have a gun that has some intrinsic value, either a family gun, or maybe a fancy barrel that has a quarter rib, custom sights, octagon, etc, that would be expensive to duplicate. Such barrels make sense to rebore.
Back to plane old rechambering… Just look at it this way, you must pick a chamber that is larger than the original chamber, ideally, larger in diameter and at least a little longer. Sometimes the original neck diameter was on the large size and when you rechamber it leaves a small groove or mark in the neck area of the chamber. Normally this is not a problem for function, but it leaves marks on your brass and might hinder accuracy.
Ackley Improved cartridge do now work well for single shot rechambers unless your starting from a much smaller case, like a 22 Hornet to a 22-250 AI. Now if you working with rimmed cases then an Ackley design is fine in a single shot simply because the rim handles headspace. Rimless cases headspace on the shoulder and Ackley rimless cases are .004″ shorter than the factory counterpart.
Anyway, single shots make for a fun and cheap way to try new calibers. Give it a try.