Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Federal Premium 300 Winchester Magnum ammo loaded with the Barnes 180-grain Triple-Shock X delivers ballistic performance purpose-built for North American big game. The Barnes Triple-Shock X (TSX) is a monolithic copper hollow point — no lead core, no fragmentation risk, and near-total weight retention through heavy bone and dense tissue. When you break a shoulder blade on a bull elk at 300 yards, this is the projectile that keeps driving forward.
The 300 Winchester Magnum is a belted magnum cartridge introduced in 1963, designed to push heavy-for-caliber bullets at velocities previously reserved for wildcat chamberings. Federal Premium builds this load on nickel-plated brass with a Boxer primer, reloadable and non-corrosive. Muzzle velocity is 2960 feet per second; muzzle energy is 3502 foot-pounds. The 180-grain TSX carries a G1 ballistic coefficient of 0.453, retaining energy and resisting wind drift downrange better than conventional cup-and-core projectiles of the same weight.
Performance at a Glance
The Barnes Triple-Shock X operates via controlled expansion. On impact, the deep hollow point cavity initiates radial fracture along four pre-engineered grooves, producing four cutting petals that splay outward while the shank continues forward. The result is a wound channel that combines sharp-edged cutting with deep straight-line penetration — critical when you need an exit wound on heavy game. The grooved shank reduces bearing surface against the rifling, lowering peak pressure and improving accuracy. Federal Premium matches this bullet with powders and primers calibrated to deliver consistent velocities across temperature extremes.
| Spec | Value |
|---|---|
| Caliber | 300 Winchester Magnum |
| Bullet weight | 180 grains |
| Bullet type | Solid Hollow Point (Barnes Triple-Shock X) |
| Muzzle velocity | 2960 fps |
| Muzzle energy | 3502 ft-lbs |
| Ballistic coefficient (G1) | 0.453 |
| Lead-free | Yes (monolithic copper) |
| Case | Nickel-plated brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Rounds per box | 20 |
| Intended use | Hunting |
| Manufacturer | Federal Premium |
This load sits in the middle of the 300 Win Mag ammo weight spectrum — heavy enough for bone-breaking authority, light enough to retain flat trajectory inside 400 yards. Nickel-plated cases feed smoothly in bolt-actions and semi-autos, and resist corrosion in wet-weather hunts.
Who It’s For
Elk hunters working timber or alpine bowls where follow-up shots are difficult. Moose hunters who need guaranteed penetration through heavy shoulder structure. Hunters in California or other lead-free jurisdictions where monolithic copper is mandated. Handloaders who value once-fired Federal Premium brass. Shooters who zero at 200 yards and hold over for 300-400 yard shots without dialing turrets. If you need a load that anchors game in its tracks and leaves a blood trail you can follow in low light, the 180-grain TSX in Federal Premium brass delivers that performance reliably.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Treat every firearm as if it is loaded. Keep the muzzle pointed in a safe direction at all times. Keep your finger off the trigger until ready to fire. Be certain of your target, the backstop, and what lies beyond.
- Verify current state and local ammunition laws before purchasing. Some jurisdictions impose magazine capacity limits, projectile restrictions, or lead-free requirements.
- This product contains copper. In California, this product is sold in compliance with lead-free ammunition requirements. Store in original packaging in a climate-controlled environment. Nickel-plated cases resist corrosion but should not be exposed to prolonged moisture.
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