Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For hunters who push effective range on medium to large game, 300 WSM ammo delivers magnum energy in a short-action platform. The Winchester Power Point 150 grain Jacketed Soft Point combines flat trajectory with controlled expansion — 3271 fps at the muzzle translates to 3561 ft-lbs of energy, enough to anchor whitetail, mule deer, and elk inside 400 yards. The 300 Winchester Short Magnum is a belted magnum compressed into a case 0.545 inches shorter than the .300 Winchester Magnum, fitting standard short-action rifles while maintaining near-identical ballistics. Winchester designed the Power Point bullet with an exposed lead tip and notched jacket to initiate expansion on impact, then rely on the jacket’s heavier base section to retain weight and drive deep.
Built for the Box
Winchester loads this round with a 150 grain JSP atop boxer-primed brass cases. The jacketed soft point construction uses a copper alloy jacket swaged over a lead core, with the forward section thinned to promote rapid expansion at velocities above 2200 fps. The notched jacket — visible as circumferential scoring near the tip — controls petal formation, preventing over-expansion that fragments the bullet before it reaches vital organs. At 150 grains, this is the lighter end of the 300 WSM spectrum (common bullet weights run 150–200 grains), trading some sectional density for higher velocity and flatter drop. The G1 ballistic coefficient of 0.294 is modest; wind deflection becomes measurable past 300 yards, but the speed advantage keeps time-of-flight short enough for clean hits on stationary targets.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 300 Winchester Short Magnum (WSM) |
| Bullet weight | 150 grains |
| Bullet type | Jacketed Soft Point (JSP) |
| Muzzle velocity | 3271 fps |
| Muzzle energy | 3561 ft-lbs |
| Ballistic coefficient (G1) | 0.294 |
| Rounds per box | 20 |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Intended use | Hunting |
| Manufacturer | Winchester |
The Power Point line has been Winchester’s workhorse hunting load since 1967, offering reliable terminal performance at a price point below premium bonded or monolithic bullets. This 300 WSM ammo sits between the .308 Winchester (which tops out around 2700 fps with 150 grain bullets) and the full-length .300 Win Mag (which pushes 150 grain bullets past 3400 fps). The short magnum case fits actions 0.5 inches shorter, reducing rifle weight and enabling faster cycling in bolt guns.
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 firearms safety at all times — treat every firearm as loaded, never point the muzzle at anything you are not willing to destroy, keep your finger off the trigger until ready to fire, and be certain of your target and what lies beyond it. More at NSSF.org/safety.
- Verify that your rifle is chambered for 300 Winchester Short Magnum before loading. Do not attempt to fire 300 WSM ammunition in rifles chambered for .300 Winchester Magnum, .308 Winchester, or any other cartridge.
- This ammunition contains lead. Wash hands thoroughly after handling. California Proposition 65 requires notification that this product can expose you to lead, known to the State of California to cause cancer and reproductive harm. Details at P65Warnings.ca.gov.
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