The intersection of modern sporting rifles (MSRs) and small game hunting has historically faced a mechanical limitation: firing single-projectile rifle ammunition at fast-moving small game or varmints often results in excessive meat damage, over-penetration, or low hit probability on erratic targets. Addressing this operational gap, Franklin Armory has entered the ammunition manufacturing space with the introduction of Rabbit Rounds, a patent-pending, multi-projectile cartridge designed specifically for the ubiquitous 5.56x45mm platform.
Rather than relying on traditional shotgun payloads or standard solid-projectile rifle rounds, Rabbit Rounds introduce a unique mechanical approach to small game harvesting. By combining the ballistic velocity of an AR-15 platform with a multi-projectile, spin-stabilized design, Franklin Armory is attempting to redefine how standard .223/5.56 rifles perform in pest control and hunting scenarios.
Specifications Breakdown
- Cartridge Designation: Rabbit Rounds (patent-pending)
- Chambering Compatibility: 5.56x45mm / .223 Remington / .223 Wylde (AR-pattern rifles)
- Projectile Configuration: Four hard-hitting lead projectiles encased in a multi-piece, self-discarding sabot
- Projectile Weight: 45-grain assembly
- Muzzle Velocity: 3,150 feet-per-second (from a 16-inch rifled barrel)
- Muzzle Energy: 992 ft-lbs.
- Effective Spread Range: Maintains an effective pattern beyond 40 yards
Mechanical & Design Deep-Dive
The engineering principle behind Rabbit Rounds centers on imparting spin-stabilization to a multi-projectile payload fired through a standard rifled barrel. Each round utilizes a multi-piece, self-discarding sabot that houses four lead projectiles. Upon exiting the muzzle at a blistering 3,150 fps, the sabot separates, allowing the four spin-stabilized projectiles to maintain a controlled, effective pattern out past 40 yards.
This mechanical design solves a major physics hurdle: traditional smoothbore shotshells fired through rifled AR barrels typically tumble or disperse uncontrollably due to barrel twist. By utilizing a sabot to engage the rifling and securely cradle the projectiles until clear of the muzzle, Rabbit Rounds achieve rifle-class velocities—delivering roughly double the speed and energy of traditional shotshell pellets—while providing a concentrated dispersion pattern optimized for moving targets.
Environment Suitability
Rabbit Rounds are engineered primarily for predator control, pest management, and harvesting medium-to-small game such as coyotes and wild pigs where quick follow-up or increased hit probability on evasive targets is paramount.
Operating from a standard 16-inch AR-15 barrel, the 992 ft-lbs of energy ensures lethal performance within close-to-intermediate engagement envelopes. Because the payload disperses into a controlled pattern rather than a single point of impact, the rounds are exceptionally well-suited for dynamic field conditions where targets may dart rapidly across open terrain, reducing the margin for error inherent in single-projectile aiming.
Alternatives Analysis
When examining small game solutions for the AR-15 platform, shooters typically choose between reduced-load single projectiles, traditional .223 varmint hollow points, or aftermarket upper conversions firing rimfire ammunition (like .22 LR).
While a standard .223 hollow point offers precision at distance, its small point of impact demands exact placement on fast-moving pests. Conversely, rimfire conversions lack the ballistic energy required for larger varmints like coyotes or feral hogs. Rabbit Rounds occupy a distinct niche by turning a standard 5.56 rifle into a high-velocity scatter platform, offering shotgun-like coverage at rifle velocities without requiring upper swaps or dedicated firearms.
Summary Evaluation
Franklin Armory’s Rabbit Rounds represent a clever and highly practical engineering solution for MSR owners looking to expand the utility of their firearms. By successfully pairing a multi-projectile payload with spin-stabilized sabot technology fired through a rifled barrel, the company has bypassed the traditional limitations of smoothbore adapters. For hunters and landowners dealing with pest control, Rabbit Rounds offer a high-velocity, high-probability option that breathes new versatility into America’s favorite rifle platform.