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.338 Rem. Ultra Mag

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Caliber .338 Rem. Ultra Mag load data and technical Specifications

Caliber Specifications:

Caliber:
.338 Rem. Ultra Mag
Standard / Datasheet:
C.I.P.
Bullet Diameter:
0.338" | 8.59mm
Primer Size:
Large Rifle Magnum (LRM)
Max. Case Length:
2.760" | 70.10mm
Max. Cartridge Length / OAL:
3.600" | 91.44mm
Max. Standardized Pressure:
63817 psi | 4400 bar
Case Capacity:
110.0 Grains of Water
CID:
CID_459
  • The .338 Remington Ultra Magnum (RUM) is a rifle cartridge developed by Remington Arms in 2000. It was designed as a high-velocity, long-range cartridge that would offer the power and accuracy needed for hunting and long-range shooting.

    The cartridge is based on a modified .404 Jeffery case, which was necked down to accept .338 caliber bullets. The resulting cartridge has a bullet diameter of .338 inches and a case length of 2.825 inches.

    The .338 RUM is capable of firing bullets weighing between 180 and 300 grains at muzzle velocities ranging from 2,900 to 3,200 feet per second. It is a powerful cartridge that is suitable for hunting a wide range of game animals, including elk, moose, and brown bear, at long ranges.

    One of the main advantages of the .338 RUM is its long-range accuracy, which makes it popular among long-range shooters and hunters. It is also known for its flat trajectory, which makes it easier to shoot accurately over long distances.

  • Velocity (V0)

    Energy  (E0)

    Ballistic Coefficient (BC1)

  • Bullet Weight (gr) ->
    0-50
    50-75
    75-100
    100-150
    150-200
    200-300
    >300

    The following table indicates  for this caliber and various bullet weight ranges (in grains) which powders are suitable (👍) and popular among our reloading community (👍👍).  This might evolve over time as more community members share their loads and as we accumulate more calculations and tests with our balistics calculator.

  • Weight vs. Velocity - Suitable Bullets for this Caliber

    You need to get an access license to view this chart. See an example with the following caliber: .22 Nosler

    Barrel Length  Variation vs. Velocity - by Bullet Weight

  • Number of loads in this caliber shared by community members:

    0

.338 Rem. Ultra Mag load data available with the following bullets:

(most popular first)

Filter by Bullet Weight (Grains)
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