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338 RCM Ammo

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The .338 Ruger Compact Magnum or .338 RCM is a rimless, short-length rifle cartridge based on the .375 Ruger case. It was designed by Sturm Ruger and Hornady and released in 2008 and chambered in various Ruger rifles.

The .338 Ruger Compact Magnum uses a unique case designed by Hornady and Ruger based on the powerful .375 Ruger cartridge. The fact is of a rimless design having the base and rim diameter of .532 in (13.5 mm), which is the same diameter of the belt on belted magnum cases based on the .300 H&H Magnum and .375 H&H Magnum.

This allows the cartridge to have a higher case capacity than a belted magnum case given cases of equal length. As Ruger intended the round to be chambered in short distance bolt-action rifles, the case length was shortened to 2.10 in (53 mm), which is similar to the .308 Winchester case.

About: .338 RCM

  • Type: Rifle
  • Place of origin: United States
  • Designer: Sturm Ruger
  • Manufacturer: Hornady
  • Produced: 2008


  • Parent case: .375 Ruger
  • Case type: Rimless, bottleneck
  • Bullet diameter: .338 in (8.6 mm)
  • Neck diameter: .405 in (10.3 mm)
  • Shoulder diameter: .515 in (13.1 mm)
  • Base diameter: .532 in (13.5 mm)
  • Rim diameter: .532 in (13.5 mm)
  • Rim thickness: .050 in (1.3 mm)
  • Case length: 2.015 in (51.2 mm)
  • Overall length: 2.840 in (72.1 mm)
  • Case capacity: 72 gr H2O (4.7 cm3)
  • Primer type: Large rifle
  • aximum pressure (CIP): 62,366 psi (430.00 MPa)

Ballistic performance

Bullet mass/type Velocity Energy
200 gr (13 g) Hornady SST 2,950 ft/s (900 m/s) 3,864 ft⋅lbf (5,239 J)
225 gr (15 g) Hornady Interbond 2,750 ft/s (840 m/s) 3,778 ft⋅lbf (5,122 J)

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