There's an old adage that basically says "the farther from the original you get, the less reliable". People say it definitely applies to 1911s. My personal experience is consistent with that. I've owned a couple Kimbers (Officer size and Commander size, both aluminum frames). The Officer would fail to feed with roundnose; I no longer own it. The Commander works better, but does NOT like my semi wadcutter reloads, and proved it in glorious fashion at a USPSA match! I also have a full size steel frame Springfield GI model. Guess how it runs? Flawlessly. Haven't tried the wadcutters yet, but that's coming.