Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Winchester White Box USA 300 AAC Blackout ammo in 147 grain Full Metal Jacket configuration gives you supersonic velocities (1920 fps muzzle velocity, 1203 ft-lbs energy) at a price point designed for volume shooting. This is Winchester‘s range-grade 300 Blackout load — boxer-primed brass cases, non-corrosive primers, and modern propellants engineered to reduce barrel fouling over extended firing sessions. The 147 grain FMJ projectile stabilizes reliably in 1:7 or 1:8 twist barrels and functions across AR-15 platforms with adjustable gas systems or standard carbine-length gas ports.
Load Profile
| Spec | Value |
|---|---|
| Caliber | 300 AAC Blackout (7.62x35mm) |
| Bullet weight | 147 grains |
| Bullet type | Full Metal Jacket |
| Muzzle velocity | 1920 fps |
| Muzzle energy | 1203 ft-lbs |
| Rounds per box | 200 (10 boxes of 20) |
| Case | Brass |
| Primer | Boxer, non-corrosive |
| Reloadable | Yes |
| Velocity rating | Supersonic |
| Intended use | Range & Target |
| Manufacturer | Winchester |
At 1920 fps from a 16-inch barrel, this load stays supersonic past 300 yards and provides enough recoil impulse to cycle direct-impingement and piston-driven rifles without tuning. The brass cases accept standard small rifle primers and reload cleanly — save your brass for future handloading. For shooters training with 300 Blackout ammo who need consistent feed geometry and reliable ignition across temperature ranges, Winchester White Box delivers functional reliability at a cost-per-round that supports high-volume practice.
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.
- Always follow the Four Rules of Firearm Safety when handling live ammunition on or off the range.
- Verify current state and local ammunition purchase laws in your jurisdiction — age requirements, permits, and purchase documentation vary by location.
- This ammunition contains lead. Wash hands after handling, use adequate ventilation when shooting indoors, and follow California Proposition 65 warnings when applicable.
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