Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, lifelong hunter.
For big game hunters running 20 gauge platforms, the Brenneke Green Lightning Heavy Field Short Magnum rifled slug delivers 1oz of hard-cast lead at 1392fps and 1890 ft-lbs of muzzle energy — punching well above its weight class. The 2-3/4″ shell length fits standard chambers, and the green protective coating reduces copper and lead fouling in both rifled and smoothbore barrels. Brenneke quality control ensures every round in the 5-round box meets factory specs, and the reloadable Boxer-primed brass head extends case life for handloaders. In factory testing, this slug prints sub-2″ groups at 50 yards, offering deer and hog hunters the precision needed for ethical one-shot kills at typical woods ranges.
Performance at a Glance
| Spec | Value |
|---|---|
| Gauge | 20 Gauge |
| Shell Length | 2-3/4″ |
| Shot or Slug Type | Rifled Slug |
| Slug Weight | 1 Ounce |
| Muzzle Velocity | 1392 Feet Per Second |
| Muzzle Energy | 1890 Foot Pounds |
| Barrel Type | Rifled or Smooth Bore |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Rounds/Box | 5 Round |
| Intended Use | Big Game |
The green coating reduces cleanup time — especially important for hunters shooting multiple rounds during sight-in or practicing from field positions. The rifled slug design stabilizes in-flight through barrel grooves or via the slug’s own ribs in smoothbore tubes, and the heavy 1oz projectile carries energy downrange for deep penetration on whitetail, hog, and black bear. Brenneke recommends cylinder bore or improved cylinder chokes when running these slugs through smoothbore barrels — tighter constrictions can deform the projectile and degrade accuracy. Browse more 20 Gauge Slug Ammo options for additional weights and velocities.
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 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 your state and local laws permit possession of rifled slugs and that your hunting area allows shotgun slug use during designated seasons.
- Maximum slug range extends to 2000 yards — confirm a safe backstop and clear shooting lane before firing. This product contains lead, known to the State of California to cause cancer and reproductive harm (Prop 65). Wash hands after handling.
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