Why is virtually all commercial and military ammunition for the 7.62x39mm loaded with the same bullet weight of 123gr? Does the cartridge not perform well with lighter of heavier bullets? - Quora

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Answer (1 of 9): 7.62x39mm can certainly be customized to suit particular use better - be it changing the bullet weight, composition, or powder load. But, there’s just really no commercial demand for it. One reason is monolithic market for the guns that utilize the round - mostly AK variants and

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What would happen if one attempted to fire a 7.62x51mm round from a rifle, which is specifically made to use the 7.62x39mm round as standard ammunition? - Quora