Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, lifelong hunter.
The DDupleks Steelhead Monolit 28 is a non-toxic steel slug engineered for big game hunters working overgrown terrain where brush deflection and barrier penetration decide whether you fill a tag or go home empty. A 12 gauge slug is a single projectile fired from a shotgun, as opposed to multiple pellets of shot. This 1oz steel slug exits the muzzle at 1460 fps with 2070 ft-lbs of energy, delivering the momentum needed to reach vitals through heavy cover. The waisted body stabilizes aerodynamically without relying on rifling, and polyethylene bearing surfaces reduce bore friction while keeping your barrel clean.
Built for the Brush
DDupleks builds the Steelhead from solid steel and polyethylene — no lead, no plastic wad separation, no fouling. The flat ogive transfers energy on impact rather than penciling through, and the waisted profile resists tumbling when clipping branches or saplings. You can run this slug through rifled or smoothbore barrels, and it’s safe for all chokes including full. The roll crimp and Boxer primer make each hull reloadable if you save your brass. Five rounds per box ship in polymer trays that protect the slug nose during transport.
Technical Breakdown
| Spec | Value |
|---|---|
| Gauge | 12 Gauge |
| Shell length | 2-3/4″ |
| Slug type | Solid steel monolit |
| Slug weight | 1 ounce |
| Velocity | 1460 fps |
| Energy | 2070 ft-lbs |
| Barrel type | Rifled or smoothbore |
| Choke | Safe for all chokes |
| Crimp | Roll |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Non-toxic | Yes |
| Rounds/box | 5 |
| Intended use | Big game |
| Manufacturer | DDupleks |
If you’re hunting zones that mandate non-toxic projectiles or working timber where traditional Foster slugs shred on contact, the Steelhead gives you a steel option that holds course. Browse our full 12 Gauge Slugs inventory for additional barrier-blind loads and sabot designs.
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 — finger off the trigger until sights are on target and you’ve made the decision to fire. Review the four rules of firearms safety before handling any ammunition or firearm.
- Verify that your shotgun’s chamber length matches or exceeds the 2-3/4″ shell length before loading. Firing ammunition in a chamber not rated for that length can cause catastrophic pressure failure.
- Non-toxic steel slugs are harder than lead — inspect your barrel for obstructions before firing, and confirm your choke tube (if installed) is rated for steel projectiles to prevent barrel damage.
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