Originally Posted by Coyote

My full-size semi auto is a Kimber Custom II .45acp. It has never jammed once in >500 rounds. My everyday carry is the Custom Carry .45. Also no jams. I have shot Glocks, Ruger, H&K, each at .45 and never had any problems with them either. Of course I've not put as many rounds through them as my Kimber. Personally, I prefer the .45 to 10mm or less, but it all comes down to personal preferences. My late wife shot 9mm, 10mm, and .40 better than most people at the range.

As far as barrel length goes, the longer the barrel the more accurate the shot, the more efficient the burn (more powder gets to burn within the barrel rather than outside it increasing your FPS and accuracy), and a slightly more-balanced feel (at least to me). It is more difficult to conceal, though.

If you take care of your weapons, they will take care of you.