Ammo Specifications
More Information on Hornady .300 Blackout Ammo
Hornady Frontier .300 Blackout 208 Grain Full Metal Jacket (FR410) is a subsonic centerfire rifle load designed to provide a heavy-projectile option for training, target shooting, and recreational use with firearms chambered in .300 AAC Blackout. Introduced into Hornady’s Frontier lineup for 2026, FR410 combines a 208-grain FMJ projectile with a subsonic loading and is packaged in a standard 20-round box. It expands the Frontier family beyond the existing 125-grain supersonic .300 Blackout offerings, giving shooters a factory-loaded option specifically intended for applications where subsonic ammunition is preferred.
The defining feature of FR410 is its 208-grain Full Metal Jacket bullet. At 13.5 grams, the projectile is considerably heavier than the 110- to 150-grain bullets commonly encountered in supersonic .300 Blackout ammunition. The FMJ construction surrounds the lead core with a metal jacket and is designed primarily for reliable feeding and general-purpose range use rather than controlled expansion. This makes FR410 fundamentally different from expanding subsonic hunting or defensive loads that use specialized hollow-point or expanding projectiles.
Hornady officially identifies FR410 as subsonic ammunition. Instead of propelling a lighter bullet at the higher velocities associated with conventional rifle ammunition, this load uses its heavy 208-grain projectile at a velocity intended to remain below the speed of sound. Avoiding supersonic velocity eliminates the ballistic crack generated by a projectile breaking the sound barrier. This characteristic makes subsonic .300 Blackout ammunition particularly relevant to suppressed firearms, although even suppressed firearms continue to produce noise from the firearm’s action, escaping gases, and projectile impact.
Developed around the ability to accommodate both lightweight supersonic and heavy subsonic .30-caliber projectiles, it allows shooters to select ammunition with dramatically different ballistic characteristics while remaining within the same chambering. Compared with Hornady Frontier’s 125-grain FMJ supersonic load, the 208-grain FR410 sacrifices velocity and a flatter trajectory in favor of the characteristics associated with a heavy subsonic projectile.
Because of that lower velocity, shooters should expect FR410 to have substantially more trajectory drop as distance increases than supersonic .300 Blackout ammunition. Point of impact can therefore differ considerably between 208-grain subsonic ammunition and lighter supersonic loads, even when fired from the same rifle. Function can also vary among semi-automatic firearms because subsonic ammunition produces different operating characteristics than full-velocity loads.
As part of the Frontier line, FR410 is positioned as straightforward, American-made ammunition emphasizing dependable performance and practical shooting applications. Hornady lists the exact FR410 product as .300 Blackout Subsonic, 208-grain FMJ, 20 rounds per box, distinguishing it clearly from the 125-grain Frontier loads.
For shooters seeking a heavy, non-expanding .300 Blackout load for target practice, training, or suppressed recreational shooting, Hornady Frontier FR410 offers a simple configuration: a 208-grain FMJ projectile, subsonic performance, and 20-round packaging from one of Hornady’s established ammunition lines.
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