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.300 Rem. Ultra Mag
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Caliber Specifications:
Caliber: | .300 Rem. Ultra Mag |
Standard / Datasheet: | C.I.P. |
Bullet Diameter: | 0.308" | 7.82mm |
Primer Size: | Large Rifle Magnum (LRM) |
Max. Case Length: | 2.850" | 72.39mm |
Max. Cartridge Length / OAL: | 3.598" | 91.39mm |
Max. Standardized Pressure: | 64977 psi | 4480 bar |
Case Capacity: | 112.5 Grains of Water | 7.30 cm3 |
CID: | CID_374 |
Last updated: | 3/19/2025 |
- The .300 Rem. Ultra Magnum is an incredibly powerful shell, developed in 2005 for use by serious hunters and target shooters alike. This round combines the velocity and energy of a magnum rifle cartridge with superior accuracy potential - making it perfect for taking down larger game animals out to extended distances as well as precision shooting competitions.Offering unrivaled accuracy potential from quality rifles equipped with optics, this rifle round is capable of efficiently killing even the largest game animals out to ranges that most other magnums are unable to reach - while retaining sufficient power to penetrate through thick hides and bone. Its dependable performance across temperatures and atmospheric conditions makes it ideal for shooters looking for consistent precision at extreme distances.
Weight vs. Velocity - Suitable Bullets for this Caliber
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Barrel Length Variation vs. Velocity - by Bullet Weight
.300 Rem. Ultra Mag load data available with the following bullets:
(most popular first)
Filter by Bullet Weight (Grains)
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