Any benefit in cryo-treating a hammer forged barrel before rebore/re-rifle job?? Might it help with stress relief, and/or contribute to more accurate re-bored barrel? Just wondering.

Barrel makers stress relieve their barrels after all the stress inducing work is done, not before.

Why dont you call Dan Pedersen and ask him.

I believe Krieger Cryo their blanks before the work is done to them, but they are not hammer forged. I have read much material on cryo barrel treating.Tests conducted where they did:
no cryo,
cryo before work,
cryo before and after work,.... showed that most benefit was achieved by doing cryo to the blank before any boring,cutting or shaping.It reduces exhisting stresses and due to the new nature of the metal, it reduces the build up of any new stresses from the machinning processes. Little(not necessarily none) seemed to be gained by doing cryo a second time after the barrel work was done.
For reDrilling/reboring your tube, I cannot see cryo as being unbeneficial.It will prepare/convert the metal into a better state for machining, and less final inherent stresses when the job is done.

Many including the NRA have tested cryo and found no benefit. Krieger has the equipment so they say it's wonderfull ! ...We [metallurgists] are still looking for serious research that will explain the various 'claims' of great performance for various items. No it's not the 'eta carbides' because claims include things like brass which have no carbides.....

I have yet to have one done but my new boss has cryo treated engine parts before machine work was done and the machinist complained about how hard stuff was.
I would think once a cryo'd barrel was lapped in it would foul very little and last longer. Nate

I've never seen any proof that cryo treating a barrel does any benefit at all.. That said many folks believe that they clean easier.

Personally I wouldn't invest in it.

quote:

I've never seen any proof that cryo treating a barrel does any benefit at all..

Same thing both of my gun smiths have told me. There is no conclusive scientific evidence to support it.

Krieger barrels are also cut-rifled and cut-rifling does not induce stress like button rifling and hammer forging does because metal is removed not displaced.

Hey, if it works on sperm it must work on rifle barrels, right? Next someone is going to say that putting your rifle barrel under a pyramid will make it more accurate!

In 2000, I ordered a barrel blank from Midway. My gunsmith had sent several in after he turned them. This one was sent before he did anything to it. He'd turned a bunch of this brand and many other barrels. But, never had turned one after it had been frosen.

After this one was turned, he said "this was the easiest machining barrel I've ever turned and from now on, I'll send them all in before turning them".

Send me direct e'/mail and I'll provide his phone and name for your consult.

George