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I had one of my 5" 1911s converted to 45 super by Ace Custom. It uses dual recoil springs that are like a 35# progressive. It shoots regular 230gr ball just fine (cases land about 3' away). Although I wouldn't want to use it as a carry gun, I guess the 1911 has a very large tolerance for recoil spring weight.

I was concerned about slide return frame battering with the heavy dual spring arrangement. Gary at Ace Custom told me they have a demo gun with at least 80,000 rds of 45 Super through it and it is still going strong. At least it gives me some comfort that there is a large margin of safety in the 1911 frame design.
 
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