The largest gun most people have ever shot is 12-gauge shotgun and fails in comparison to this rifle.
This beast is a .700 caliber rifle. The slugs weigh-in at 1132 grains each and can travel 1600-1800 fps.
Without the muzzle break the recoil would generate 150 foot-pound of force and knock most people to the ground. You can see just how powerful the rifle is as it has no problem shooting through a quarter-inch steel plate.