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375 REM Ammo

Find In Stock 375 RUM Ammo From Top Retailers

The .375 Remington Ultra Magnum, also known as the .375 RUM is a .375 rifle cartridge introduced by Remington Arms in 2000. The round Intended for large and dangerous game. It is a beltless, rebated rim cartridge created by necking up the .300 Remington Ultra Magnum case to .375 caliber with no other changes.

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There is a wide selection of .375 in (9.53 mm) bullets available that are suited to the high velocities of the .375 RUM, and boat tail bullets help to extend the useful range further.

.375 Remington 

  • Type Rifle
  • Place of origin United States
  • Production history
  • Designer Remington
  • Designed 2000


  • Parent case : .300 Remington Ultra Magnum
  • Case Type: Beltless, rebated-rim, bottleneck
  • Bullet diameter .375 in (9.5 mm)
  • Neck diameter .4050
  • Shoulder diameter .5250 in (13.34 mm)
  • Base diameter .5500 in (13.97 mm)
  • Rim diameter .534
  • Case length 2.850
  • Overall length 3.600 in (91.4 mm)
  • Rifling twist 1-12"
  • Primer type Large rifle magnum
  • Maximum pressure 65,000 psi (450 MPa)

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