I like the 340/360 because (much better sights than a typical J frame, and (2) light weight. I’ve got a 340 M&P coming for those reasons. Will I shoot .357’s in it? Probably not. Will it be a great .38+P carry gun? You bet. I’ve carried a638 for a long time, and am very confident with it. It’s had a LOT of rounds downrange since 2012. I’m getting old and better sights are a good thing to have. I’ve shot a 340PD with magnum rounds-don’t care for it. Aside from recoil being on the nasty side my split times were in the tank. Is .357 “overkill” in this platform? For me, yeah. Still it hurts nothing to have an extra capability IF you want/need it