Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For hunters running modern magnum rifles, Buffalo Bore Supercharged 300 Winchester Magnum ammo pushes 168-grain Barnes TTSX bullets to 3200 feet per second and 3819 foot-pounds of muzzle energy. This is maximum-SAAMI-spec ammunition engineered for modern firearms only — older or weaker actions should not chamber this load. The Barnes Tipped Triple-Shock X projectile combines 100-percent copper construction with a polymer tip that boosts ballistic coefficient to 0.47 and initiates rapid expansion on game. Four cutting petals peel back to double the permanent wound channel, delivering anchor performance on elk, moose, and heavy-bodied deer at extended ranges.
Built for the Box
Buffalo Bore loads this cartridge in new-production brass cases with non-corrosive Boxer primers, making spent cases reloadable for handloaders who dial in their own magnum recipes. The 168-grain Barnes TTSX carries a sectional density of 0.253 and maintains supersonic velocity well beyond 600 yards, holding wind deflection tighter than conventional cup-and-core bullets of similar weight. Each box contains 20 rounds of lead-free ammunition suitable for jurisdictions with non-lead hunting regulations.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 300 Winchester Magnum |
| Bullet weight | 168 grains |
| Bullet type | Barnes Tipped Triple-Shock X (TTSX), polymer tip |
| Muzzle velocity | 3200 fps |
| Muzzle energy | 3819 ft-lbs |
| G1 ballistic coefficient | 0.47 |
| Sectional density | 0.253 |
| Rounds per box | 20 |
| Case | Brass, reloadable |
| Primer | Boxer, non-corrosive |
| Lead-free | Yes |
| Intended use | Hunting — modern rifles only |
| Manufacturer | Buffalo Bore, United States |
This load sits at the upper edge of SAAMI pressure limits for the 300 Winchester Magnum cartridge, requiring rifles manufactured with modern steel and headspace tolerances. Verify your rifle’s action type and year of manufacture before ordering. Shop our full selection of 300 Win Mag ammo for controlled-expansion hunting bullets, match-grade target loads, and reduced-recoil practice rounds.
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.
- Observe the four universal rules of firearms safety at all times when handling live ammunition and firearms.
- Verify current state and local laws regarding ammunition purchase, possession, and use — some jurisdictions restrict high-velocity magnum cartridges or require non-lead projectiles for hunting.
- This product can expose you to lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov.
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