Gaintwist works, but be sure you are comfortable with the steel alloy that Colerain is using for your barrel. Perhaps that is not an issue, but it may be.
Yeah, you know, Brent, I just became aware of this 12L14 alloy issue. Never would have dawned on me that modern day barrel making could involve a steel with questions attached to it. I spent a lot of time today reading up on this, and it does seem that the 12L14 steel is suitable to black powder and not to smokeless. We have Colerain barrels on our flintlocks, and never had an issue. Very accurate, dimensionally correct. It does make me wonder if I should ask Scott at Colerain to make this .62 barrel out of 4140 or some other more rugged steel. The charges in the .62 rifle barrel will be substantial. They will test that steel. Hmmmmmmmmmm
