If you are considering having your rifle rebored to a larger caliber you need to know that there is some customer assumed risk! Seldom are there any problems associated with the process, but, you need to know that occasionally I do lose a barrel during the rebore.
1. I do not know exactly what the steel content is in factory barrels. Each manufacturer specifies their own mix of steel, and seem to change those specifications at irregular intervals. Most modern steels cut smoothly and cleanly, but some do not.
Barrels that often do not cut cleanly:
• Sako uses a type of steel for their button barrels that is unsulpherized, it cuts to a rough finish.
• Old Winchester barrels seem to have hard and soft spots the entire length of the barrel.
They often will have small tears in the bottom of the groove.
• Old Flaig barrels have a high vanadium content and do not cut cleanly.
• Hammer forged barrels occasionally have microscopic air voids created during the forging process.
• Ruger Stainless Steel button barrels.
• Mauser military barrels about a 50/50 chance of cutting cleanly.
2. The reboring process is a multiple step machining process involving up to 25 reamer pulls to get your barrel up to the new bore diameter. Then the rerifling process involves the rifling cutter moving in and out of the barrel approximately 300 times (50 times per groove). Occasionally during this process something goes wrong. The rifling machine is automatic in its cycling and if a problem occurs, it usually ruins the tooling and the barrel before I can stop the process.
With all of that said, if we have not scared you away, the reboring process is an excellent way to restore an old rifle without having to have a new barrel contour reinletted into your stock, and having the gun reblued. It is generally a much less expensive way to have a caliber change done or to obtain a rifle in a cartridge that is not available through mass manufacture. Accuracy is generally better than original (see some of the rebore targets)
Be assured that Classic barrel stands behind our work. We will do the best job that we can on every job that we accept! Our policy is that if a major problem occurs with your barrel we will not charge you for the work that has been done, and we offer to make you a new barrel at a discounted rate.
(up to 4 calibers larger) Example .22 to .270 or .308 to 9.3 • Larger changes add $5.00 per caliber
Rebore/Rerifle barrel only ..........$250
Rebore/Rerifle/Rechamber w/o setback .........$345
Rebore/Rerifle/Rechamber with setback (Ack. Imp.conversions) .........$395
Q. How much is a reboring job?
A. Typically $345, plus return freight.
Q. Will the rifle need to be reblued?
A. Not if I do my job right, and if I cause the problem, I will stand the cost of the refinishing.
Q. Do you recrown the barrel?
Q. Turn around time?
A. Usually about 4 months, but it depends on the # of jobs in the shop, or if I happen to be running a batch of the same caliber, could be longer or shorter time.
Q. How is the accuracy of a rebore?
A. It is usually as good as, or better than the factory barrel shot. You are getting a brand new cut rifled barrel on the inside. Be aware that we do not do the squaring and trueing on a rebore job that we do on a new barrel install, unless you request that process.
Q. How do you remark the barrel?
A. We mill the old cartridge designation out of the barrel marking with a small end mill, and then engrave the new cartridge name into the small oval recess. Cold blue is applied to return color to the shallow cut that we’ve made.
Q. What are the limitations to reboring?
A. The new cartridge must use the same case family as the new cartridge (30-06 to 35 Whelen) or the new cartridge must be bigger in all dimensions than the old cartridge (22-250 to .243 Win). The cartridge must still fit into the action, but we can change bolt face diameters and magazine boxes. The barrel wall thickness must meet or exceed 125 thousandths per side (250 total) for safety, at the muzzle. For example, a 30 caliber rebore can be no less than .550 at the muzzle (.300 plus .250).
Q. How long or short of a barrel can you rebore?
A. No shorter than 20 inches, no longer than 34 inches.
Q. Can you rebore barrels for gas or pump rifles?
A. No. The mounting hardware or gas blocks are too large to go through the headstock of my rifling machine, I cannot center them, and therefore cannot rerifle.v