FedArm 7.62x39mm - General Ammunition Discussion - International

What can you tell me about the origins of this 7.62x39mm cartridge? Appears to be re-manufactured with a confirmed M-43 projectile, but why the added cannelure? Soviet head stamps from 3, 17, and 60, early 1970’s dates. Sold in the US from a Gun Broker listing. Came in a 500 round box with no markings.

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FedArm 7.62x39mm - General Ammunition Discussion - International

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