According to Wikipedia, the .950 JDJ round is
"The .950 JDJ is the world's largest, and most powerful caliber rifle cartridge.[citation needed] Loaded .950 JDJ cartridges are approximately the length of an empty .50 BMG casing (i.e., 4"), and are based on a 20x102mm case shortened and necked up to accept the .950" bullet. Projectiles are custom-made and most commonly weigh 3,600 grains (230 g) which is 8.2 ounces or over half a pound."
These guns are too heavy for anything useful, cost upwards of $8000 and rounds are $40 a pop. My favourite factoid about this beast is "The muzzle energy of the .950 JDJ is comparable to the kinetic energy of a 2,800 lb (1,300 kg) automobile traveling at 20 mph (32 km/h).". Errrmmm...
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