7.62x39
I have a 7.7 Arisaka(.311-.312) I converted to 7.62x39 and shoot 150 grain corelockt (.308) through it. At 100 yards it will keep up with any new .30 caliber rifle out there. I only have access to a 100 yard range, so after that I don't know. I have head shot a few deer with it out to that distance and a little more with total confidance. I did try .311 150 grain bullets and they would not group well at all. A 7.7 barrel is 91/2 twist, go figure. I also have a 7.7 that was set back and re-cut to .300 savage. I picked it up at a yard sale years back. It is not as accurate as the 7.62x39, but I only ever used factory ammo in it. You might be surprised what .308 bullets will do in a .311 barrel. I also have a ***anese rifle that was converted to 30.06 by the U.S. Army during the Korean war, that one just won't shoot well and I gave up on it. You just never know.
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