[1] It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes.
Remington factory loads produce 2,760 ft/s (840 m/s)[3] with a 300 grain (19 g) bullet for 5,070 ft·lbf (6.88 kJ) of muzzle energy.
The intended use of this cartridge includes hunting large, thick-skinned game.
[1] It is powerful enough to kill any land animal[1] and, with its high velocity, can do so at fairly long ranges.
Double Tap loads to the specifications attributed to handloader limits.