Head Scratcher on 7.62x39 Ammo

[Grayone]

I have acquired some ammo in 7.62 by 39. Headstamp is 539 and opposite on head is 76. I believe this is ammo from the Tula plant in Russia and made in 76? I wonder if anyone knows whether this ammo is corrosive primed?? Case has a copper wash over steel.

[relics6165]

I don't for sure know that it is, but you should "assume" that it is. I do remember when that all came in, it was referred to as "mildly corrosive".

Yeah, right.............kinda like being slightly pregnant.

[Grayone]

Thanks for the reply. I have sanded a piece of steel and used the anvil to hold a piece of brass with primer for a test. I used a phillips head screwdriver for a firing pin and tapped the primer, usual safety procedures in place. I left the primer debri exposed steel on the back porch and will see if rust develops in the exposed area.

[deces]

It is very unlikely that it was made in 76. There is always a small chance that Russian ammo may be slightly corrosive due to both types of primers being made in house, it is documented being the case.

[Outpost75]

Is corrosive.

[Grayone]

Update; Slight flash rusting on the metal so will treat as corrosive and use for range sessions. Thanks for the reply's!