05-04-2012, 06:18 AM
Rapier Wrote:TX,
I think I came upon what was happening with the Lee dies. I understand that back last year in the spring, I believe, the 6.5 Grendel bolts were changed by Alexander to what is called a Type II bolt. The Type II bolt has .010 of bolt face clearance. Lee dies may well have changed their sizer to match because the Lee dies I bought were advertised as Alexander Arms dies. Now, the 6.5 Sporter by Model 1 and the 264 LBC both use a Type 1 bolt face with a standard .003 or close to that, bolt face clearance. I kept having chambering problems that made no sense until I went through buying a new barrel with a guy that just bought a new Black Hole barrel and ran into the question, do you want a Type I or a II.......
Ed
Alexander Arms has not changed the bolt design, unless there's something I missed. They have always used the original Colt 7.62x39 bolt design, which has a .135" bolt face depth.
Many after-market companies started making their own 7.62x39 bolts with the same depth as a 5.56 bolt, which is .124", hence the .011" difference.
BHW started out with their Type I bolt as a .124" face depth, and have now gone to a .135" depth for the Type II.