Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For deer hunters running smoothbore shotguns, the Brenneke K.O. 12 gauge rifled slug brings 1oz of lead to bear at 1650 fps and 2491 ft-lbs of muzzle energy. A rifled slug is a single projectile designed to stabilize through smoothbore barrels by external rifling — grooves cut into the slug body that engage the bore as it travels downrange. Brenneke manufactures this load in Germany under strict quality control, ensuring dimensional consistency and reliable expansion.
Load Profile
The K.O. slug uses a 1oz lead projectile with a polymer sabot designed for smoothbore barrels. In controlled testing, the slug expands to .9″ on impact and produces 5-shot groups measuring under 1.5″ at 50 yards — sufficient accuracy for vitals on whitetail, mule deer, or hog at woods distances. Muzzle velocity of 1650 fps drops to approximately 1320 fps at 100 yards (manufacturer data), maintaining over 1500 ft-lbs at that range. The 2-3/4″ shell length chambers in all 12 gauge shotguns rated for 2-3/4″ or longer shells. Brenneke recommends cylinder bore or improved cylinder chokes; chokes tighter than modified may damage the slug or barrel. The Boxer primer and brass base make this round reloadable for handloaders who cast their own slugs or reuse Brenneke hulls.
Specs at a Glance
| Spec | Value |
|---|---|
| Gauge | 12 Gauge |
| Shell length | 2-3/4″ |
| Shot/slug type | Rifled Slug |
| Slug weight | 1 Ounce |
| Velocity | 1650 Feet Per Second |
| Energy | 2491 Foot Pounds |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Barrel type | Rifled or Smooth Bore |
| Rounds/box | 5 Round |
| Intended use | Big Game |
| Manufacturer | Brenneke |
This load chambers in any 12 gauge smoothbore shotgun rated for 2-3/4″ shells or longer. For more deer-hunting slug options, browse the full 12 gauge slugs 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.
- Treat every firearm as if it is loaded. Keep the muzzle pointed in a safe direction. Keep your finger off the trigger until ready to fire. Be certain of your target and what lies beyond it.
- Verify current state and local ammunition laws before ordering. Some jurisdictions restrict lead projectiles for hunting or require non-toxic slugs.
- This product contains lead, a chemical known to the State of California to cause cancer and reproductive harm. Wash hands after handling ammunition.
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