Trucker3573 said:
The stock mag does have the weakest spring of any gun i own.
Does your mag have the little bump on the (straight) follower, or is it the rounded-follower version? When I bought mine, they shipped with the rounded-follower 8-round mags (made by Metalform, with Kimber's name on them). About a year ago, they switched to the straight, bumped-follower 9-round version (made by Checkmate, with Kimber's name on them). The Checkmates have a stiffer spring that the Metalforms. I switched to the Checkmates a couple of years ago, but I only load them to 8 rounds.
I had lots of jams with mine, and had lots of work done to try to make it reliable, because I liked everything else about it more than any other 1911. I think the reliability after the last work is less than 1% failure rate (shooting my DoubleTap carry rounds exclusively), but I won't know how much lower (if any) the failure rate is until I've shot it a good bit more.
You might try buying one Metalform mag (or one Checkmate mag, if that;s the one you don't currently have), and see if it runs better for you. Your failure rate is WAY too high (obviously). A common feeding problem is a too-tight (or badly shaped) extractor.
I finally gave up on Kimber's ability or willingness to fix mine, and started using local gunsmiths. My third (and hopefully last) gunsmith is the one who has finally gotten mine running pretty well.