After a few long months of not shooting my .45 BE, I picked up a 250-rd Mega Pack of Remington UMC 230-grain FMJ and went to the range with some friends, where I proceeded to exhaust the entire box. After a hundred or so rounds, I started to notice that occasionally the slide would not close all the way when feeding. All it would take was a light touch on the back of the slide to get it to close, but it's still a problem.
Here are my observations:
1. This problem doesn't show up until the gun gets a little dirty, and gets worse with more rounds fired.
2. It is probably partially caused by limp-wristing. I noticed that if I took extra care to control the recoil when firing, it didn't happen. It happened a lot more when a less-experienced friend of mine shot the gun. However, I generally keep a pretty good handle on the gun anyway and it still happened occasionally with me. I wouldn't expect a quality weapon to require mounting in a vise when shooting.
Any ideas on how to prevent this in the future? I had considered polishing the feed ramp/chamber several months ago, but the more serious feed problems I had been having attenuated as the gun was broken in. I also thought that a stiffer recoil spring might solve the current problem. I don't think the problem lies in the magazines, as the bullets manage to make it up the ramp but just don't slide into the chamber all the way.