I was "lucky" enough to score 2 boxes of 50rds each (100rds total) of Winchester SXZ 9mm Luger 115gr FMJ Flat Nose "Training". Has anyone else had experience with this ammo? My M9-A1 ran great and all but as I was disassembling it to clean it tonite, I noticed it was extremely dirty after running only 2 mags through her. Is this normal for this type/brand of ammo? I've run several types/brands through it and don't ever recall it being this dirty.