The cartridge on the right is a .375 RUM loaded with a 260 grain Nosler Partition 2900 fps from a 26" barrel. And it has 4856 ft lbs of energy at the muzzle.
The cartridge on the left is a .460 Wby and the bullet is a 500 grain Hornady DGX at 2300 fps. It has a 5874 ft.lbs of energy at the muzzle.
Kinda makes the .300 RUM look puny.