Yesterday at the range, my Colt 1911 had several failures to feed on the last round in the mag. This happened with two different Wilson mags. Each time, the round failed to fully strip from the magazine and got hung up on the feed ramp. The Colt has only about 400 rounds through it. This is my first time owning a Colt 1911. But not my first time shooting. I have never had this happen with my Glock, CZ, or HK M23. I'm perplexed. Please help!