Another 'is this ammo corrosive' thread

[cote_b]

So I recently bought a bunch of MFS 7.62x39. Normally I would know that any modern black box mfs is non-corrosive. However, this stuff is in a white box and the head stamps look very much like rounds of corrosive surplus. Maybe this ammo was pulled apart and reloaded into surplus cases with non-corrosive powder and primers? Or maybe I just unknowingly paid way too much for corrosive ammo? What can you tell me about this ammo.

 

[Scotty454]

Test it yourself? Pull the bullet, dump the powder, and pop the primer on a nail (Or something made of carbon steel). Then you'll have a definitive answer, and won't be taking someone's word for it.

 

[Ganderite]

I am guessing that the 78 is a date stamp and that will be important.

I do not know if the Combloc eventually switched to no-corrosive primers.

But the idea of your own test is a good idea. Fire an empty case onto a nail in a block of wood and wait to see what happens. Put another nail beside it for comparison. If the fired one rusts quickly, it was salted by the primer.

 

[Ganderite]

I am guessing that the 78 is a date stamp and that will be important.

I do not know when the Combloc eventually switched to no-corrosive primers. I am guessing around 1975 to 1980.

But the idea of your own test is a good idea. Fire an empty case onto a nail in a block of wood and wait to see what happens. Put another nail beside it for comparison. If the fired one rusts quickly, it was salted by the primer.

 

[jonnyc]

As East-Bloc milsurp, I would just go ahead and assume it was corrosive, and clean accordingly.

 

[VanIsleCam]

So many people afraid of cleaning their 7.62x39 boomers.

 

[cote_b]

I’ll give the nail test a try next chance I get

 

[saskcop]

I agree that the nail test is the only way to be sure. I did it once with a bunch of different types of ammo and was absolutely amazed at what was actually corrosive and what was being sold as "non-corrosive".

 

[cote_b]

I have a feeling this stuff is corrosive. Will find out in a few weeks.

 

[zuke]

I am guessing that the 78 is a date stamp and that will be important.

I do not know when the Combloc eventually switched to no-corrosive primers. I am guessing around 1975 to 1980.

But the idea of your own test is a good idea. Fire an empty case onto a nail in a block of wood and wait to see what happens. Put another nail beside it for comparison. If the fired one rusts quickly, it was salted by the primer.

That's how I did my ammo test's, which I still have for reference. I used a torch to set off the primer's

 

[oops]

So many people afraid of cleaning their 7.62x39 boomers.

Can not figure out the issue with corrosive ammo either....so what,it is cheep.....and you have to clean your gun.