Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Federal Premium pairs the 300 Winchester Short Magnum case with Barnes’ monolithic copper TSX bullet — a lead-free hunting round designed for controlled expansion and terminal performance on medium to large game. The 165-grain Barnes Triple-Shock X exits the muzzle at 3130 fps with 3589 ft-lbs of energy, placing it in the flat-shooting magnum class for elk, moose, and heavy-bodied game inside 400 yards. Federal Premium matches each bullet with select powders and boxer primers in nickel-plated brass — reloadable, non-corrosive, and quality-controlled for consistency.
Built for the Box
The Barnes Triple-Shock X is machined from a single billet of copper, with no lead core and no jacket separation. The deep hollow-point tip initiates four radial cutting petals on impact, creating a wound channel that penetrates bone and tissue without fragmenting. Grooved shanks reduce copper fouling and improve accuracy across long strings of fire. Federal Premium manufactures this load in the United States under strict quality control, ensuring each of the 20 rounds in the box delivers repeatable ballistics from first shot to last.
The Numbers
| Spec | Value |
|---|---|
| Cartridge | 300 Winchester Short Magnum (WSM) |
| Bullet weight | 165 Grains |
| Bullet type | Solid Hollow Point (Barnes Triple-Shock X) |
| Muzzle velocity | 3130 Feet Per Second |
| Muzzle energy | 3589 Foot Pounds |
| G1 Ballistic Coefficient | 0.398 |
| Rounds/box | 20 Round |
| Case | Nickel Plated |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Lead Free | No (contains copper only, no lead core) |
| Intended use | Hunting |
| Manufacturer | Federal Premium |
This load is engineered for hunters who need a flat-shooting magnum round with controlled expansion and deep penetration on heavy game at distances where the 300 WSM’s velocity advantage matters. The Barnes TSX’s one-piece copper construction and near-100% weight retention make it a reliable choice in elk timber, open plains, and mountain terrain where shot angles vary. Browse more options in our 300 WSM ammo category.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun 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.
- Observe the four rules of safe firearm handling — finger off trigger until ready to fire, muzzle in a safe direction, know your target and what is beyond it, treat every firearm as loaded.
- Verify current federal, state, and local laws before purchasing or possessing ammunition — regulations vary by jurisdiction and may include background checks, permits, or waiting periods.
- This ammunition is marked supersonic and produces significant muzzle blast — wear appropriate hearing protection on the range and in the field.
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