The Hornady Superformance .300 Winchester Magnum 165-grain CX Monolithic Solid Polymer Tip Brass 20-round box is a high-velocity centerfire rifle cartridge engineered specifically for long-range big game hunting where flat trajectories, retained downrange energy, and total structural integrity are required. A common friction point with standard .300 Win Mag loads is rapid velocity loss over extended distances and inconsistent bullet breakup upon striking heavy shoulder bone. Hornady completely resolves both limitations by pairing specialized progressive propellants with an advanced copper-alloy monolithic projectile, achieving significantly higher velocities without increasing chamber pressure or sacrificing terminal performance.
The core technical advantage relies on the synergy between internal ballistics engineering and projectile construction. Hornady's Superformance propellants extend the acceleration curve across the entire length of the barrel, increasing muzzle velocity by 100 to 200 FPS over conventional loads without exceeding SAAMI pressure limits. Beneath the surface, the solid copper-alloy CX (Copper Alloy eXpanding) bullet eliminates jacket-core separation to deliver 95%+ weight retention through heavy bone. Furthermore, the patented Heat Shield polymer tip resists aerodynamic thermal deformation during high-speed flight, maintaining a consistent 0.440 G1 ballistic coefficient for predictable downrange trajectory modeling.
Launched at a blistering muzzle velocity of 3,260 FPS, this 165-grain load produces exceptionally flat trajectories and high retained kinetic energy at extended distances. The CX bullet's engineered shank grooves minimize bearing surface friction against the rifling, reducing copper fouling in the barrel and sustaining shot-to-shot accuracy across long strings. Assembled in premium, reloadable virgin brass cases fitted with non-corrosive Boxer primers, this cartridge delivers smooth chambering, positive extraction, and dependable ignition across diverse environmental conditions.
Key Benefits
- Superformance Progressive Propellants: Increases muzzle velocity by 100–200 FPS over standard loads without exceeding SAAMI pressure limits.
- Monolithic CX Copper-Alloy Construction: Eliminates jacket-core separation for 95%+ weight retention and deep bone penetration.
- Patented Heat Shield Polymer Tip: Resists aerodynamic friction and thermal deformation to preserve a true 0.440 G1 ballistic coefficient.
- Grooved Shank Design: Reduces bearing surface friction and barrel fouling to maintain consistent downrange accuracy.
Technical Specification
- Ballistics: .300 Winchester Magnum | 3,260 FPS Muzzle Velocity | 0.440 G1 Ballistic Coefficient | Extended-Range Terminal Profile
- Projectile: 165 Grain | CX (Copper Alloy eXpanding) Monolithic Solid | Heat Shield Polymer Tip | Grooved Shank
- Case/Primer: Precision-Drawn Virgin Reloadable Brass Case | Non-Corrosive Boxer Primed
- Logistics: 20 Rounds Per Box | Hornady Superformance Series
- Dimensions: Standard .300 Win Mag Geometry | Long Action Bolt-Action Rifle Configuration | SKU: 820264
- Application: Big Game Hunting, Whitetail Deer, Mule Deer, Elk, Black Bear, Antelope, and Lead-Free Zones
- Standards: SAAMI Compliant | Hornady Factory Precision Quality Benchmarks
When you need repeatable external ballistics and terminal reliability from a .300 Win Mag platform, this load delivers measurable performance advantages without compromising pressure safety. Get it from SMKW, a trusted source for field-proven ammunition that meets real-world hunting requirements
