Well, I have my 91/30 Mosin, and have about 550 rounds of this ammo left, and I think its jamming hte gun up bad. About 40 or so rounds go NO [problem, then the bolt starts to stick very badly. I have to bang on it either with my hand, or sometimes with a rubber mallot to get it open. IU dont know if its the ammo. Ive heard its Laquer building up. But right now, im just lost. My last batch of ammo didnt do this, this batch does. SO im guessing the ammo. Since i have so much, id like to find a way to combat this.