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.

300 AAC Blackout headstamp list - General Ammunition Discussion

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Steam Community :: Guide :: Nordic Armory 3.0

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Brand Used Works Auction Catalog - Gun Collectors Dream Auction

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Some information on Techcrim (Russia) Made Ammunition - General

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300 AAC Blackout headstamp list - General Ammunition Discussion

Techcrim / Russian 8x57 IS - General Ammunition Discussion