Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Buffalo Bore Supercharged Varmint 243 Winchester load delivers 3650 feet per second from a 70-grain Nosler Ballistic Tip—270 fps faster than factory-standard 243 varmint rounds. That velocity translates to 2070 foot-pounds of muzzle energy and a flat trajectory out to 300 yards, cutting wind drift and drop on prairie dogs, ground squirrels, and coyotes. Buffalo Bore loads to maximum SAAMI pressure specifications, so this ammunition requires a modern bolt-action or single-shot rifle in good condition—do not use in older, weaker actions or semi-automatic platforms not rated for +P-equivalent pressures.
Ballistic Snapshot
The Nosler Ballistic Tip’s polycarbonate tip initiates expansion the instant it contacts hide or fur, driving the thin gilding metal jacket back into the lead core. The result: violent fragmentation and massive energy transfer within the first 6 inches of penetration. The boat-tail base and .31 G1 ballistic coefficient keep the 70-grain projectile supersonic past 400 yards, and the heavy base resists deformation under the high pressures this load generates. Each case is new-manufacture brass with a Boxer primer—anneal the necks after two or three firings to extend case life when reloading.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 243 Winchester |
| Bullet weight | 70 grains |
| Bullet type | Nosler Ballistic Tip (polymer tip) |
| Muzzle velocity | 3650 fps |
| Muzzle energy | 2070 ft-lbs |
| G1 ballistic coefficient | 0.31 |
| Sectional density | 0.169 |
| Rounds per box | 20 |
| Case | Brass |
| Primer | Boxer, non-corrosive |
| Reloadable | Yes |
| Intended use | Hunting (varmint) |
| Lead-free | No |
| Country of origin | United States |
This load joins other high-velocity varmint options in our 243 ammo category—compare BC, energy, and price per round to match your rifle’s twist rate and intended range.
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 rules of firearm safety at all times—treat every rifle as if it is loaded, keep your finger off the trigger until ready to fire, never point the muzzle at anything you are not willing to destroy, and know your target and what lies beyond it.
- Verify your state and local laws regarding possession and use of rifle ammunition—some jurisdictions restrict lead projectiles for hunting or impose magazine capacity limits that affect how many rounds you can load.
- Buffalo Bore Supercharged loads generate pressures at or near SAAMI maximum—use only in modern bolt-action or single-shot rifles in good mechanical condition. Consult your rifle’s manual or contact the manufacturer if you are uncertain whether your action is rated for maximum-pressure loads.
California Proposition 65 Warning: This product contains lead, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands thoroughly after handling ammunition and components. For more information: www.P65Warnings.ca.gov.
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