When it comes to rifles, it doesn't get bigger than the .950 JDJ. This 50-pound centerfire log of a gun uses a 2,400-grain load (240 grains powder) at a velocity of 2,100 feet per second. That's 25,400 foot-pounds of muzzle energy in all. The recoil, as described in this video, is equivalent to 10 .30-06s firing at once.
If this sounds like something better suited to a tank, you're right. Per an e-mail, it's similar to a World War I tank shell, although Gun Digest is not able to confirm this trivia.
The folks at Knight Arms head to the range to fire the behemoth in this video.
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