It has been done. I think Ed Brown and a couple other custom-type folks sell them. Apparently, it is a very tricky conversion to get to run right, however.
A better solution for a fast .355" bullet in a 1911 is .38 Super or 9x23.
Well, since you can get both single-stack and double-stack 1911's chambered in .40 S&W, it shouldn't be hard to drop in a 357 SIG barrel and get it working. However, when I asked Para-Ordnance about this on one occasion, they replied that they had "no plans" to produce any 1911's in this caliber. I don't know why... perhaps 10mm. in the 1911 platform is a superior combination?
FYI: I have a Para Ordnance P-16 (1911 type double stack .40 cal) that I ordered an Ed Brown barrel for. I fitted it myself (much advise from my 'smith) and installed it. No spring changes and no mag changes needed-they all work. It is SUPER accurate, runs absolutely 100% and is a ton of fun. Makes my P-16 quite versatile and I like it very much.
I don't see why other 1911's in .40 couldn't be done the same way.
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