The Nosler Trophy Grade .300 Remington Ultra Magnum (RUM) 165-grain Partition Spitzer Soft Point Brass 20-round box is a flagship centerfire rifle cartridge engineered specifically for big game hunting, trophy elk pursuits, moose, and apex predator hunting at long range. Standard cup-and-core soft points frequently experience total structural failure, core-jacket separation, or premature fragmentation when driven at extreme magnum velocities above 3,000 FPS. Nosler resolves these high-velocity terminal constraints through its legendary dual-core Partition projectile design, delivering controlled front-half expansion while safeguarding the rear core to drive through dense muscle and heavy shoulder bone.
The core technical advantage relies on Nosler's 165-grain Partition bullet engineering. A solid, integral copper-alloy web physically separates the projectile into two distinct lead cores. Upon high-velocity contact, the fully tapered front jacket section initiates immediate, mushrooming expansion to maximize hydrostatic shock and create wide wound channels. Simultaneously, the solid copper partition halts jacket tearing, retaining up to 65% to 70%+ of the bullet's original mass within the enclosed rear core. This protected rear section acts as a heavy slug, driving deep linear penetration through thick hide, heavy ribs, and shoulder structures.
Launching its 165-grain Partition projectile at a blistering factory-rated 3,350 FPS muzzle velocity (generating 4,113 ft-lbs of muzzle energy), this Trophy Grade load takes full advantage of the .300 RUM's massive case capacity to deliver ultra-flat trajectories and decisive knockdown power out to extended distances. Assembled in Nosler's custom-prepped virgin brass cases—featuring deburred flash holes and uniform primer pockets—with non-corrosive match Boxer primers and clean-burning propellants, the cartridge guarantees smooth feeding, reliable chamber sealing, and positive extraction in precision bolt-action magnum rifles.
Key Benefits
- Dual-Core Partition Construction: Solid copper web physically stops jacket tearing to preserve rear core mass and ensure deep penetration.
- Tapered Front Jacket: Initiates rapid, uniform expansion upon impact to deliver immediate energy transfer and wide tissue disruption.
- Blistering 3,350 FPS Velocity: Maximizes downrange point-blank range, flattening trajectory for long-range big game shooting.
- Custom Prepped Nosler Brass: Fully prepped cases ensure consistent neck tension, tight velocity spreads, and smooth bolt cycling.
Technical Specification
- Caliber: .300 Remington Ultra Magnum (.300 RUM)
- Ballistics: 3,350 FPS Muzzle Velocity | 4,113 Ft-Lbs Muzzle Energy
- Projectile: 165 Grain | Nosler Partition | Spitzer Soft Point (SP) | Dual Lead Core | Solid Copper Partition Web
- Case/Primer: Precision-Drawn Nosler Custom Prepped Virgin Brass | Clean-Burning Powder | Non-Corrosive Match Boxer Primed
- Logistics: 20 Rounds Per Box | Nosler Trophy Grade Ammunition Series
- Dimensions: Standard .300 RUM Geometry | SKU: NOS60064
- Application: Big Game Hunting, Trophy Elk, Moose, Bear, Bighorn Sheep, and Extended-Range Hunting
- Standards: SAAMI Compliant | Nosler Quality Control Benchmarks
If you’re running a .300 RUM for large game and need consistent terminal performance at high impact velocities, this load solves expansion control and penetration balance. Get reliable lot-to-lot consistency and properly prepped components from SMKW, a trusted source for field-proven ammunition.
