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Until a couple of weeks ago I also thought that all were .323 grooved. Then I read an article by Allan Jones of Shooting Times where he mentioned that early 8MM rifles were manufactured with a smaller 'J' bore using .318 projectiles. So my confusion was sufficient to resort to this forum to...

I have read that some early 98 Mausers had a .318 bore. If that is true short of measuring with caliper will serial number tell me anything?