Non corrosive. I fired off several thou rounds of it back in the day whan Marstar and Districorp used to stock it. I miss that ammo. If I recall it used to be $149. for 1200 rounds of non-corrosive ammo packed in commercial cardboard boxes. They came stacked in a wooden ammo crate.
I ran that stuff through SKS's till the barrels were too hot to touch. What fun! Used to do rapid strings all the time at the Stittsville range on purpose to piss off all the 40 something gun snobs with $6000 banchrest rifles firing one shot like every 30 or 40 minutes between insulting everyone else about their "cheap kit". Great fun. Would never do that at my own club, but I hate Stitts and it's crowd in a very special way. Place has been going downhill ever since Clint died and his son in law took over... but that's another story...