MAXIM DEFENSE MXM-49143 SHORT BARREL AMMO 8.6 BLACKOUT 285 GR 20 RNDS

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Maxim Defense SBA Short Barrel Ammunition (MXM-49143) is a match-grade, lead-free 8.6 Blackout load engineered specifically for short-barrel rifle platforms, delivering subsonic terminal performance that exceeds the wound cavity standards of both expanding and fragmenting projectile designs. Developed in partnership with Fort Scott Munitions and built around patented Tumble Upon Impact technology, the Maxim Defense SBA (MXM-49143) is a purpose-built round for suppressed hunters, tactical shooters, and 8.6 Blackout platform owners who demand reliable, ethical terminal performance at subsonic velocities.

Key Features

• Manufacturer part number: MXM-49143
• Caliber: 8.6 Blackout
• Bullet weight: 285 grain
• Projectile type: Solid Copper Spun (SCS), lead-free, TUI Tumble Upon Impact design
• Muzzle velocity: 1056 fps from a 12-inch barrel
• Cartridge overall length: 1.965 inches
• Case overall length: 2.800 inches
• Optimized test barrel: 12 inch with 1:3 twist rate
• Quantity: 20 rounds per box
• UPC: 680017491437
• Manufactured by Maxim Defense Industries in partnership with Fort Scott Munitions

Special Features

• The Tumble Upon Impact projectile design causes the solid copper bullet to tumble immediately upon entering soft tissue, creating a large, disruptive wound channel that exceeds the performance of conventional expanding and fragmenting projectiles at comparable velocities
• The TUI tumbling effect remains active all the way down to 500 fps, meaning the projectile continues to perform terminally even after significant velocity loss through a suppressor or at extended range, which is a meaningful advantage over expanding designs that require higher impact velocities to open reliably
• The Solid Copper Spun projectile is CNC machined from solid copper bar stock, producing a dimensionally consistent round with no lead core, no bonding, and no jacket separation, resulting in match-grade uniformity from the first round to the last
• The load is optimized specifically for short-barrel 8.6 Blackout platforms with 1:3 twist rates, meaning the powder charge, bullet weight, and seating depth are all tuned to produce reliable ignition, consistent pressure, and stable flight from barrels in the 8 to 16-inch range rather than being adapted from a standard-length load
• Lead-free construction makes this ammunition legal for hunting in all lead-restricted zones in the United States, opening up California and other regulated environments where standard jacketed lead-core ammunition is prohibited
• The subsonic velocity profile combined with the heavy 285-grain projectile produces high sectional density and deep straight-line penetration before the tumble effect initiates, giving the bullet the momentum to reach vital organs through heavy muscle, bone, and dense tissue

Practical Benefits

• For suppressed 8.6 Blackout hunting rifles, the 285-grain subsonic load keeps muzzle report to a minimum while delivering terminal performance on deer, hogs, and predators that rivals or exceeds supersonic loads in wound channel size and penetration depth
• The TUI design that functions reliably down to 500 fps makes this load a practical choice for hunters taking shots at extended ranges where velocity has dropped well below the threshold required for traditional expanding bullets to perform
• The lead-free solid copper construction means hunters can use the Maxim Defense SBA (MXM-49143) in any hunting zone without needing to carry a second type of ammunition for regulated areas, simplifying the pack list on any hunt
• The CNC-machined projectile consistency translates directly to repeatable accuracy at the bench and in the field, which matters when shooting a suppressed short-barrel platform where the shooter is already managing a reduced sight radius and unique recoil impulse
• At 20 rounds per box, this load is appropriately packaged for hunting use where a shooter carries a field supply rather than volume range ammunition, keeping cost manageable while ensuring enough rounds for a full hunting session
• The partnership between Maxim Defense and Fort Scott Munitions brings together two manufacturers with deep experience in short-barrel ballistics and solid copper projectile design, resulting in a load that is purpose-built rather than repurposed from a standard platform

The Maxim Defense SBA Short Barrel Ammunition (MXM-49143) in 8.6 Blackout is a capable tool for suppressed hunters and tactical shooters who run short-barrel 8.6 Blackout platforms and demand consistent, ethical, lead-free terminal performance at subsonic velocities from the first round to the last.