well is this true or not but i have no idea, but i heard that on a 40s&w gun,all you need to turn it into a .357sig is a new barrel, if this is so, and there are .22lr conversion kits, than i feel that 40s&w is an incredibly versitale handgun, you have moderate stopping power, cost effectiveness in the 40s&w, incredible power in the 357sig, and incredibly cheap shooting out of a 22lr for days for spending nearly nothing.
i just bought a glock 17, my next pistol is going to be a 40s&w i think