Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Brenneke Magnum 20 Gauge rifled slug delivers full-power big-game performance from a lighter-recoiling platform. This 3″ shell launches a 1-ounce lead slug at 1476 feet per second, generating 2120 foot-pounds of muzzle energy — enough to anchor whitetail, hogs, and black bear at ethical ranges. A 20-gauge slug is a smoothbore shotgun projectile, typically featuring helical ribs that impart spin for improved stability and accuracy downrange. Brenneke’s rifled-slug design has served deer hunters for decades, pairing a controlled-expansion lead core with a rear-attached felt or plastic wad that keeps the slug oriented in flight. Barrel compatibility is unrestricted: fire this load through rifled or smoothbore tubes with chokes no tighter than improved cylinder.
Performance at a Glance
Each shell is assembled under strict quality control, using Boxer primers and reloadable hulls that meet range and field demands. Factory testing reports five-shot groups under 2 inches at 50 yards, and the round’s moderate recoil profile makes it accessible for younger or recoil-sensitive shooters stepping into big-game hunting. The roll crimp and full-length hull construction ensure reliable feeding in pump-actions and semi-automatics alike.
| Spec | Value |
|---|---|
| Gauge | 20 Gauge |
| Shell Length | 3″ |
| Shot or Slug Type | Rifled Slug |
| Slug Weight | 1 Ounce |
| Muzzle Velocity | 1476 Feet Per Second |
| Muzzle Energy | 2120 Foot Pounds |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Barrel Type | Rifled or Smooth Bore |
| Crimp | Roll |
| Rounds per Box | 5 |
| Intended Use | Big Game |
| Non-Toxic | No (lead slug) |
Because this load is chambered for 3-inch magnum shells, verify your shotgun’s chamber length before firing. Use in 2¾” chambers will cause excessive pressure and potential injury. More 20-gauge slug options are available in our 20 Gauge Slug Ammo catalog.
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 shoot. Know your target and what is beyond it.
- Verify your state and local laws before purchasing. Some jurisdictions restrict lead projectiles or slug ammunition.
- This product contains lead, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. Maximum slug range exceeds 2000 yards — ensure a safe backstop.
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