I have a sardine can of Romanian made 7.62x39 head stamp SADU 12 7.62x39

I there a way to tell if its corrosive?
Thanks Dave

It is, if it's military.
Only way to tell for sure is to fire a primer against a piece of bare steel and you will see overnight. Unless you live in Arizona, which you don't. You can also fire a known non corrosive primer against another control piece of bare steel to compare how much they rust.

Thanks, I fired a couple rounds and it has three holes for the primers.
These are the numbers on the tin, UO 1/13 NEQ 1,12kg are any of them a date code?
Dave

The primers are corrosive. Not nasty corrosive like 7.62x45,easy to clean.

Corrosive is corrosive; fail to clean your non chrome barrel and you won't like it regardless. the date should be stamped on the head of the cartridge.

quote:

SADU 12 7.62x39

that's all that is on the head
Thanks for the info
Dave

12 is the year of mfg.

I suspect all 7.62x39 military to have corrosive primers.

As stated clean your firearms after use.

Yes, and you have to use a solvent that will cut the salts from the primers; most oil based bore cleaners won't do that. I use water, or surplus RBC. If you just oil the bore, or use most petroleum based oils, the rust will just form under the oil.
Water is best as it is free, Except in California.

quote:

suspect all 7.62x39 military to have corrosive primers.

i have 2+ cases of non corrosive

I'm not sure if anything has changed in 20 years but any former Soviet ammo was corrosive to some extent.