I took a Taurus 1911 45 in trade.(gun is new) I was having a problem with jams using winchester white box hollow points. The rounds would start into the chamber but the rear of the shell wouldn't slide up. This caused the round to stay at an angle jamming with the slide 1/2 open. this happened maybe 3 times out of the box of 50. Is this a mag problem or a problem with the case rim catching on the extractor. I haven't been able to find any more ammo to try other mags. This is my first time with a 1911 style 45 so i'm still a little green....