revolvers are also good for variable load powers- since the recoil doesn't have to work the action, you can have soft .38spl and hot .357Mag loads one right after the other, with no affect on function...

only practical application that I can think of right now is rat shot, tho... and I've got .45ACP snake shot that works great (don't use it INSIDE the garage, tho)

I only own 1 revolver, and it's just a hi-standard .22LR (was my Grandfather's)- it does rat shot well, holds 9 shots- would be even better if it could do .22WMR, but it's an early model aluminum frame.
I could see myself getting a .460 S&W Magnum revolver someday (something you just don't see in an semi-auto), but I'm with BPTactical otherwise... I prefer the capacity & reload speed of a semi-auto.