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FrankenMauser · August 31, 2013, 09:42 PM

A perfect bore should be around .311" groove diameter. But... most are far from perfect. You'll find commie bores that range from .310" to .318" (8mm

). Most are in the .312" to .315" range.

But... if you're shooting jacketed bullets, it doesn't really matter. The grooves are quite deep in Mosins, and often even work well with .308" bullets. I wouldn't worry about bore diameter, unless you want to shoot lead bullets.

TMW -
What do you mean by "decent groups" ?
3 inches? 5 inches? Minute-of-barn?

August 31, 2013, 09:42 PM	#6
FrankenMauser Senior Member Join Date: August 25, 2008 Location: In the valley above the plain Posts: 13,421	A perfect bore should be around .311" groove diameter. But... most are far from perfect. You'll find commie bores that range from .310" to .318" (8mm ). Most are in the .312" to .315" range. But... if you're shooting jacketed bullets, it doesn't really matter. The grooves are quite deep in Mosins, and often even work well with .308" bullets. I wouldn't worry about bore diameter, unless you want to shoot lead bullets. TMW - What do you mean by "decent groups" ? 3 inches? 5 inches? Minute-of-barn? __________________ Don't even try it. It's even worse than the internet would lead you to believe.