Appreciating the responses. Based on them, I think I'd be most comfortable with a .357 Sig barrel in a .40 P229 or a Glock 23, since the gun is basically the same with a slightly narrower barrel (inside, same exterior dimensions). The .40 case being necked down to .357 would let the magazines, extractor, etc. all function the same.
16 Pistols, 5 Rifles, 1 Shotgun, no time to shoot them