Federal Fusion MSR 300 AAC Blackout Ammo 150 Grain Bonded Round Nose Box of 20

Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.

Federal Fusion MSR 300 AAC Blackout ammo pairs a 150-grain bonded round nose projectile with propellants optimized for the short barrel lengths common to AR-15 and bolt-action MSR platforms. At 1900 feet per second and 1202 foot-pounds of muzzle energy, this supersonic load maintains expansion and penetration on whitetail, hogs, and similar-sized game out to 200 yards. The molecularly fused jacket wraps a pressure-formed lead core, controlling upset without fragmenting through hide and bone. A G1 ballistic coefficient of 0.33 keeps the trajectory manageable at carbine distances, and the brass case with Boxer primer reloads cleanly for shooters who roll their own.

Built for the Box

Federal engineered the Fusion MSR line around the constraints of AR-platform chamber pressures and gas system timing. Fast-burning, low-flash propellants generate the 1900 fps velocity through a 16-inch barrel without overgassing the action or producing excess muzzle signature. The primer is compatible with free-floating firing pins — a feature of many MSR bolt carrier groups — reducing slam-fire risk during rough handling or rapid mag changes. The military-style colored case iris (visible at the case mouth) confirms consistent metallurgy batch to batch, and the non-corrosive Boxer primer seats in reloadable brass for extended case life.

The Numbers

This load sits at the heavier end of 300 Blackout supersonic offerings, trading some velocity for sectional density and downrange energy retention. Expect a 50-yard zero to put you roughly 2 inches high at 100 and back on at 150, with about 6 inches of drop at 200 — fast enough to hold center-mass on a shoulder shot without dialing or holding over. For more 300 Blackout options, browse our full 300 Blackout ammo selection.

Matching It to Your Build

Fusion MSR delivers the most consistent performance in gas-operated carbines with 10.5- to 16-inch barrels and adjustable gas blocks. The fast-burning propellant peaks pressure early in the bore, keeping the gas impulse in the sweet spot for standard carbine buffer systems. Bolt guns handle it without issue, though the real engineering shows in semi-auto reliability — clean cycling across temperature swings and minimal carbon buildup in the gas tube. If you’re running a suppressor, verify your gas system is tuned for supersonic loads; Fusion MSR will cycle suppressed, but overgassing on a wide-open block will accelerate carrier speed and hammer your brass.

On the Range

Zero at 50 yards with a 1.5-inch scope height, then confirm drops at 100 and 150. The bonded construction holds together through light brush and rib bone, so practice quartering-away and frontal shots on paper or steel silhouettes sized to deer vitals. Recoil is mild — comparable to 7.62×39 — and muzzle blast from a 16-inch barrel is tolerable without a brake. If you’re crimping your own reloads, start with the spent Fusion MSR brass; it’s thicker in the web than some bulk 300 Blackout cases and holds up through multiple resize cycles. Store boxes in a cool, dry location away from solvents and heat sources, and keep them out of reach of unauthorized users.