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7.62x39????
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<blockquote data-quote="436" data-source="post: 492614" data-attributes="member: 16609"><p>I did one about 12 years ago…. one on a Rem 722 action 0.470" bolt face. I machined a ring 0.447" i.d for the bolt face; tig welded that in, machined the bolt face again, cut out and installed a Sako extractor... I didn't bother with the magazine or the feeding at the time; it was only needed for the project rifle at the time'…, test platform for subsonic ammo and suppresser.</p><p> I had Pac Nor send me {two} 24" inch barrels'…, one Polygonal 1-10 twist .308 cal, the other 5 groove 1-10 twist in .311 cal. Both barrels were tested on the action with loads made up with Sierra bullet Pro Hunter bullet 180gr SPT .308 &.311 cal.</p><p> </p><p> The rifle shot great with both bullets & barrels... But the clear winner in the end subsonic was the .308 cal in both subsonic {heavy slow bullets} and supersonic {the standard 123gr in .30 cal}.... most likely due to the Polygonal barrel and twist. </p><p> With all that said; the 5 groove in .311 cal shot the surplus ammo "great" surprised the hell out of me, how accurately it would shoot the Chinese {copper wash} surplus ammo'…, that can't seem to be found anymore., at least in any quantity. </p><p> Anyway, good luck that's my .02 on the subject.</p><p> 436</p></blockquote><p></p>
[QUOTE="436, post: 492614, member: 16609"] I did one about 12 years ago…. one on a Rem 722 action 0.470” bolt face. I machined a ring 0.447” i.d for the bolt face; tig welded that in, machined the bolt face again, cut out and installed a Sako extractor... I didn’t bother with the magazine or the feeding at the time; it was only needed for the project rifle at the time’…, test platform for subsonic ammo and suppresser. I had Pac Nor send me {two} 24” inch barrels’…, one Polygonal 1-10 twist .308 cal, the other 5 groove 1-10 twist in .311 cal. Both barrels were tested on the action with loads made up with Sierra bullet Pro Hunter bullet 180gr SPT .308 &.311 cal. The rifle shot great with both bullets & barrels... But the clear winner in the end subsonic was the .308 cal in both subsonic {heavy slow bullets} and supersonic {the standard 123gr in .30 cal}.... most likely due to the Polygonal barrel and twist. With all that said; the 5 groove in .311 cal shot the surplus ammo “great” surprised the hell out of me, how accurately it would shoot the Chinese {copper wash} surplus ammo’…, that can’t seem to be found anymore., at least in any quantity. Anyway, good luck that’s my .02 on the subject. 436 [/QUOTE]
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