7.62x39 Corrosive or not?

[Calum]

I got a couple of little red boxes of ammo from the former Yugos, brass cases, FMJ, very nice stuff to shoot, but sadly it is also Berdan primed (two little holes visible inside). Not sure if it corrosive or not. But I'm treating it as if it is.

Labeled New generation.
Head stamp:
91
14

Anyone know more about this stuff?

I can post a pic later if you guys want.

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