Most powerful gun in the world?

The most powerful handgun in the world would be a .500 Smith and Wesson X-Frame revolver. The most powerful rifle in the world would be the .950jdj developed by J.D. Jones of SSK Industries with a 3 600gr bullet and flys at 2 200 ft/s, the cartridges are $40 each!!!

Actually the 600 nitro express is the most powerfull pistol in the world and this ain't know guess I've done research the .500 Smith and Wesson is no match. Im a fan of smith and Wesson but when i saw the nitro express I hd to find out which one was more powerfull. But I agree with you on the rifle.