When 357sig became the major calibre to have (we cant use 40cal) for IPSC here in Australia. Folks convert their 9/38 STI Edges & similar 1911/2011 handguns. They had gunsmiths open up the breach face to accept the 40cal case. The bigger issue was getting sig rounds to feed reliably out of the mags.
I have a CZ TS 40 that has a 9mm barrel fitted & reamed to accept a 357sig case (remanufactured 40cal case is what I use) case. 100% reliable, using TS 40 mags.