Have a new P380. Have fired 570 rounds through it. When I disassemble, I can drop a new, un-fired round in the chamber and it rattles. Not a snug or tight fit, totally loose. When I invert the barrel, the round falls out. 20 of the rounds fired were Underwood +P Xtreme Defenders (1400 FPS), but I read that the P380 is good for +P. The ejected casings are dirty and the bottom of the slide is quite dirty. Is this normal?