I have 6-50rnd. boxes of korean 30 carbine ammo. I wanted to do a primer test but could not budge a bullet with one of those hammer type pullers. Tried to pull it with pliers but could only get it to turn, could not get it out. Lot # 1-320, headstamp PS 75. Finely cut case below bullet and did a primer test but very little residue on the steel. Are bullets so tight a saftey hazard (hi-pressure?) and is ammo non-corrisive? Any comments appreciated. Thank you.