The bolt in my mosin never used to be sticky. But at the range a couple weeks ago after every shot it took a gargantuan effort to open the bolt. Normally I use Bulgarian silver tip but the range doesn't allow steel core so I tried tula steel case fmj. I also stripped, cleaned, and oiled the bolt prior to this. I'm trying to figure out if the sticky bolt is from the ammo or something to do with me taking the bolt apart.