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Arisaka 6.5 converted to 7.62x39
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11-02-2010 11:15 PM
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Yes it would be considerably more strain, if you use factory ammo. CIP pressure figures for the 7.62x39 are about 20% higher than for the 6.5x51R. So I would not use factory ammo, but go to a Moisin-Nagant forum and look for tips on downloading the 7.62x39 and using a slower powder. The Arisaka rifle barrel is considerably longer than a Kalaschnikow, which may explain why CIP gives a higher muzzle energy for the Arisaka. So also take a sideways look at which powder others use for the 7.7mm Arisaka, with a similar barrel/bore relationsship (but a much larger case), and after that, it's your judgement and your responsibility.
I hope your rifle was properly proofed after the conversion....
Patrick
Last edited by Patrick Chadwick; 11-03-2010 at 06:16 AM.
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Originally Posted by
Patrick Chadwick
Yes it would be considerably more strain, if you use factory ammo. CIP pressure figures for the 7.62x39 are about 20% higher than for the 6.5x51R. So I would not use factory ammo, but go to a Moisin-Nagant forum and look for tips on downloading the 7.62x39 and using a slower powder. The
Arisaka rifle barrel is considerably longer than a Kalaschnikow, which may explain why CIP gives a higher muzzle energy for the Arisaka. So also take a sideways look at which powder others use for the 7.7mm Arisaka, with a similar barrel/bore relationsship (but a much larger case), and after that, it's your judgement and your responsibility.
I hope your rifle was properly proofed after the conversion....
Patrick
Great points Patrick and the rifle was certainly shot enough...I will run ten rounds through it in the test rig in succession with factory stuff. If there is no difficulties I will grab some dies ect for 7.62 x 39...(Oh no an excuse to get more dies..: ) )and figure some loads for it.
Thanks again..
Old Joe
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I had a Vietnamese (Communist) conversion of a Type 38 that was given to me. Shot it once, observed the spent case, and promptly ruined it by trying a 5.56 conversion. Turns out they're fairly rare, but I didn't have a clue at the time. Currently, it's back to 7.72x39, but not as it was "as issued" to whatever low echelon peasant that had prove his loyalty.
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