I'd also have to go with the 340PD--but I'd have it loaded with 158 grain +P .38's.
I have fired that revolver with full snort .357's, and let me tell you this...I have taken my .500 Smith and Wesson (4 inch barrel) to the range, with 50 350 grain bullets, loaded on 45 grains of H110, and fired them all of in a single session. I would rather fire 100 rounds through my .500, than fire TWO magnum rounds through that .340. Two rounds of full power stuff, and my hand hurt for five days.
Hiding in plain sight...