It is a heavy revolver with great shot, able to kill with a few shots a person, it has a lot of recoil and it's very slow.It would cost $ 125 000 because of its great shooting power, surpassing thus to the .44 magnum .Its damage of .500 S&W Magnum will be -16 hp
(If you do not like the damage, change it)
This video is from the revolver .500 S & W Magnum in real life:
images of the revolver in real life :
I hope you like the suggestion