The Winchester Copper Impact .300 Winchester Short Magnum (WSM) 180-grain Extreme Point Lead-Free Solid Copper Brass 20-round box is a high-performance centerfire rifle cartridge engineered specifically for harvesting elk, moose, black bear, and heavy big game in lead-restricted hunting zones. A primary friction point with traditional lead-core cup-and-core bullets when fired from short-action magnum platforms is heavy fragmentation and jacket-core separation upon striking shoulder bone or thick hide, which reduces penetration depth and limits terminal effectiveness. Winchester resolves these structural and compliance constraints by pairing its precision-drawn reloadable brass cases with an all-copper monolithic Extreme Point projectile, delivering near-100% mass retention, deep linear penetration, and non-toxic lead-free performance.
The primary technical advantage relies on the single-piece solid copper body integrated with an oversized Extreme Point polymer tip and a 0.470 G1 ballistic coefficient. Free from internal lead core separation pathways, the monolithic copper construction enables the bullet to maintain structural integrity through dense muscle and heavy bone. Upon target contact, the enlarged polymer tip accelerates hydraulic expansion across a massive impact surface, initiating rapid expansion into strong copper petals while the solid rear shank drives straight through vital organ zones.
Launching its heavy 180-grain solid copper bullet at 2,900 FPS, this Copper Impact loading provides high kinetic energy transfer, flat flight paths, and excellent wind resistance at extended distances. Assembled using premium reloadable Winchester brass cases, clean-burning propellants, and non-corrosive Boxer primers, it guarantees consistent chamber pressure, reduced barrel fouling, and smooth feeding across short-action magnum bolt-action rifles chambered in .300 WSM. It is an outstanding selection for lead-free state mandates, public land expeditions, and heavy big game hunting.
Key Benefits
- Monolithic Solid Copper Construction: Single-piece lead-free design eliminates core-jacket separation to retain near-100% weight.
- Extreme Point Oversized Polymer Tip: Accelerates hydraulic expansion to create broad impact channels and immediate energy transfer.
- 0.470 G1 Ballistic Coefficient: Streamlined boat-tail profile preserves downrange velocity, flattens trajectory, and resists wind drift.
- 100% Lead-Free Compliance: Meets all state, federal, and public-land non-toxic-hunting mandates without sacrificing lethality.
Technical Specification
- Ballistics: .300 Winchester Short Magnum (.300 WSM) | 2,900 FPS Muzzle Velocity | 0.470 G1 Ballistic Coefficient
- Projectile: 180 Grain | Extreme Point® Lead-Free | Monolithic Solid Copper | Oversized Polymer Tip | Boat-Tail Base
- Case/Primer: Precision-Drawn Virgin Reloadable Brass Case | Non-Corrosive Boxer Primed
- Logistics: 20 Rounds Per Box | Winchester Copper Impact Series
- Dimensions: Standard .300 WSM Geometry | Short-Action Magnum Bolt Rifle Compatible | SKU: X300SCLF2
- Application: Heavy Big Game Hunting, Elk, Moose, Black Bear, Mule Deer, and Lead-Free Zones
- Standards: SAAMI Compliant | Winchester Factory Quality Control Benchmarks
Secure consistent terminal performance and regulatory compliance with Winchester Copper Impact .300 WSM from SMKW, a trusted source for field-proven hunting ammunition and technical-grade firearm support.
