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The main idea here is how military designations pair a cartridge’s size with its official service name. The AK-47 and AKM fire the 7.62×39mm cartridge. In Soviet military nomenclature, that cartridge was designated the M1943 (often referred to as M43 in many sources). So the full designation for the ammo these rifles use is 7.62×39mm, M1943. The other options point to later or variant designations that don’t match the standard cartridge used by these weapons.