By Mike Dickerson

Federal’s new Fusion MSR ammo is optimized for hunting with AR platforms

AR platform guns have been widely proclaimed to be “America’s rifle,” but the complexity of their design can sometimes cause issues, most notably with ammunition that individual rifles may not like.

Federal ammunition has set out to minimize those problems with its new Fusion MSR (Modern Sporting Rifle) line of ammo. Standard Fusion ammo has been around for some time, and has earned a reputation for affordable accuracy and good performance on game with bullets consisting of a jacket that’s molecularly fused to a pressure-formed lead core.

The author tested Fusion MSR ammo in 223 Rem. and 308 Win. The ammo is also loaded in 338 Federal and 6.8 SPC. The Fusion MSR 223 Rem load averaged 2,950 fps and produced one-inch average groups at 100 yards out of a Remington R-15 carbine with an 18 in. barrel. The 308 Win Fusion MSR load has a factory stated velocity of 2,770 fps out of a 20 in. barrel, but came quite close to that mark when tested in a 16 in. barrel.

With Fusion MSR, the primer, propellant, bullet and case have all been optimized for hunting—and just about any other use—with AR rifles. The line currently includes a 62-gr. .223 Rem. load, a 150-gr. 308 Win. load, a 185-gr. 338 Federal load and 90- and 115-gr. 6.8 SPC loads. We tested the 62-gr. .223 Rem. and 150-gr. 308 Win. loads.

The new ammo utilizes Federal’s Gold Medal GM205R primer, which is a little less sensitive than the standard 205 primer. This helps to reduce the potential, however slight, of slam fires with an AR’s free-floating firing pin.

The cartridge case used in MSR ammo has a harder head, and primers are staked to aid in primer retention. It is entirely possible for an AR to operate out of time, which can result in the case not being fully supported while still in the chamber. This can cause dropped primers, which can jam up your rifle in a hurry. Harder cases are also more resistant to deformation upon extraction and ejection, a plus for reloaders.

Federal’s Gold Medal GM205R primer is used in MSR ammo. It’s less sensitive than standard 205 primers to help reduce any potential for slam fires with free-floating AR firing pins. Primers are also staked and the case head is harder to further aid in primer retention.

All Fusion MSR bullets are boat tail designs, for flatter trajectories, and have internal skiving to ensure expansion across a wide range of velocities. “The Fusion bullet will perform great at the velocities that we are getting in these loads,” says Daniel Compton, Federal Premium product specialist. “You will get a great balance of bullet expansion and weight retention to ensure plenty of terminal damage and penetration depth.”

The new ammo uses faster-burning powders and is optimized for maximum velocity with standard pressures for 16-inch barrels with the .223 Rem. load and 20-inch barrels with the .308 Win. load. To satisfy my curiosity, I tested the .223 load out of a Remington R15 carbine with a slightly longer 18-inch barrel and shot the 308 load out of a DPMS GII Compact Hunter rifle with a shorter 16-inch barrel.

The 308 round stepped out at an average velocity of 2,714 f.p.s., which is quite close to the factory stated velocity of 2,770 f.p.s., even though the barrel was four inches shorter than optimal for the load. The .223 load, out of an 18-inch barrel, averaged 2,950 f.p.s., some 200 f.p.s. faster than factory stated velocity.

MSRP for Fusion MSR ammo is in the $28 to $31 range, but you can find it at real-world prices of around $21 per box of 20.

“We were looking to get as much speed as we could out of shorter-barrel platforms with these loads,” says Compton. “All the powders in these loads feature flash suppressants as well, mainly catering to nighttime hog and varmint hunters.”

I haven’t shot anything other than paper with the Fusion MSR ammo yet, but those who have report excellent terminal results on deer and hogs, even with the .223 round. At the range, the ammo performed well. The .308 load produced average groups measuring under 1.5 inches at 100 yards, while the .223 load shot one-inch average groups with a half-inch best group. That level of accuracy out of short-barreled ARs will handily get the job done whether you’re hunting or defending the castle. There were no issues with feeding, extraction or ejection with either load.

Happily, the price of the new ammo won’t break the bank. MSRP per box of 20 is $27.95 for the .223 load and $30.95 for the .308 load, but you can find both at real-world prices of around $21 a box.

AS TESTED:

Federal Fusion MSR .308 Win. 150-gr.     

Velocity: 2,714 f.p.s., 16-inch barrel

Extreme velocity spread: 48 f.p.s.

Standard deviation: 15.8

Ballistic coefficient: 0.414

Best Group: 1.10”

Federal Fusion MSR .223 Rem. 62-gr.

Velocity: 2,950 f.p.s., 18-inch barrel

Extreme velocity spread: 49 f.p.s.

Standard deviation: 19.1

Ballistic coefficient 0.310

Best Group: 0.52”