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Old September 16, 2012, 05:31 PM   #5
Dfariswheel
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Join Date: May 4, 2001
Posts: 6,822
The bi-metal 7.62x39 (AK-47) bullet doesn't have a copper jacket.
As with most of the Russian military and commercial ammo, the jacket is mild steel with a thin copper wash plating to prevent rust, over a lead core.
This copper coating is very thin and can be easily scraped off as the OP has indicated.

If you recover a 7.62x39 steel bullet at the range you'll find the copper plating is largely gone from the rifling and friction in the bore.
Only commercial type bullets in the 7.62x39 have a real copper jacket over a lead core, and most of those are American made bullets.
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