I posted this earlier somewhere else, but hopefully there is a more specific knowlegebase here.. Hello, I just bought a Gen 4 Glock 21 and shooting it today I noticed that on every casing, there were significant powder burns on one side. The burns go down to a little over half-way. I shot three different brands. Federal 230gr fmj - all casings were burned Winchester 230gr fmj - all casings were burned Federal Hydro-shok 165 gr hollow point - less burned, but still some. Should I be worried about this? Would it affect velocity/ accuracy? I wouldn't have even noticed, but a gentleman at the range picking up brass for reloads said he hadn't seen it before. Talking to the shop I purchased it, they suggested I try different ammo. * * ** Thanks Wanna kill these ads? We can help!