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7.62x39 is .310" not .312"My hunch is he's looking to use bullets for the British 303 as it's .312" just like the 7.62x39. Don't know if there's a 303 bullet light enough, though.
I would think the .312 bullets will swaged down if you can get them to chamber. Pressure could increase so I would start with beginning load data for the bullet weight. I purchased some 154gr factory Wolf 7.62x39 ammo before so I would start with 150gr .312 bullets if you have them.Us built ar in 7.62x39, what's your load? Brass,primers, powder,projectiles?
Not if you read the CIP standards.7.62x39 is .310" not .312"
Bullet diameter | 7.85–7.9 mm (0.309–0.311") SAAMI 7.92 mm (0.312") CIP |