Corrosive vs Errosive primers

[dand883]

I have been reading some threads lately and it made me think of when i first got my sks i had picked up a crate of czech S&B milsurp ammo and was told it was non corrosive, but i emailed the company with the lot number just to be sure.
The guy who emailed me back said that it was indeed corrosive but he also said it was errosive, which still strikes me as a little strange. I have never heard of anyone refering to any ammo as errosive before, though it seems like common sense that eventually the bore would wear out from too many rounds being fired, though this is probably way more then i will ever fire. But to actually call it errosive seems a little excessive, or was their ammo just that much rougher on guns? Or could it just be that english didn't seem like his first language and maybe got lost in translation somewhere?

 

[frykasj]

Some old primers used ground glass in their recipes, I guess that might lead to accelerated bore erosion.

 

[bearhunter]

The fellow that emailed you back, may have been referring to the erosive qualities of the powder being used as a propellant.

The milsurp Bofors #44 powder, sold by Higginson's many moons ago comes to mind.

It was a good consistent powder with a burn rate identical to IMR3031 but it was dirty. It was also erosive. I was using it in a Mod 70 Win FWT chambered in 257 Rob, because it was the powder I had on hand in quantity that worked best in that rifle. After only 300 rounds, I noticed that I had to seat the bullets further out to maintain accuracy. There were a couple of factors that may have caused the change so I didn't check out the leade erosion. After another hundred rounds, accuracy again started to wane. That's when it was time for a closer inspection.

The leades were nitrited badly and looked like they had been filed down and sand blasted.

I was cleaning properly and regularly but just wasn't paying enough attention, other than there wasn't any dirt or blue streaks on the patches and the bore was shiney. That's when I learned about "EROSIVE" propellents.

That was close to 20 years ago and there was a fellow from the Ukraine that answered my query on an international site, friendly to firearms. Understand, 20 years ago this was done with hard copies that were hand written.

As with the primers, the Bofors powders of that era had a clay/graphite compound coating that was very consistent but corrosive and would also break down over time, causing the powder to deteriorate. He was right, within another 10 years, all of the #44 powder I had on hand went bad.

 

[dand883]

Would this be as noticable in a chrome lined bore? And should i avoid shooting this ammo if possible?
Or with an sks is the noticable difference insignificant where it's not made for super accuracy anyways

 

[canucklehead]

Dude - the SKS was MADE for that kind of ammo.. no harm done. Fire at will!!!