50 Beowulf – 350 gr FMJ – Underwood (557) – 200 Rounds

Shooting a 50 Beowulf is half the fun of owning one, and an FMJ load keeps the cost of that fun manageable. This listing is Underwood 50 Beowulf 350 grain full metal jacket flat nose ammo, MPN 557, sold as a 200 round bulk case.

The 350 grain FMJ flat nose bullet is a non-expanding range bullet that feeds reliably from 50 Beowulf magazines. Underwood rates this load at 1,775 fps with 2,449 ft-lbs of muzzle energy and a sectional density of .20, so you get the same heavy recoil and point of impact as hunting loads for realistic practice, steel work, and function testing.

The 50 Beowulf was developed by Alexander Arms to put true big bore power in an AR-15. It runs on a standard AR-15 lower with a 50 Beowulf upper, bolt, and magazines, and is also known as 12.7x42mm. A common question is whether 50 Beowulf can be fired in a 450 Bushmaster rifle, and the answer is no: the cases and bullet diameters are different, so only fire it in a firearm marked 50 Beowulf. With heavy .500 inch bullets, the 50 Beowulf is a short-range powerhouse best suited to hogs, deer, and bear inside about 150 yards, and its recoil is noticeably stouter than a standard AR-15. FMJ bullets do not expand, so this is a range load rather than a hunting round. A 200 round case keeps a big bore AR busy.

Underwood Ammo 557 is new production ammunition, not reloads, made in the USA. Each cartridge uses a brass case with a boxer primer and is non-corrosive, and the boxer primed brass is reloadable for handloaders. Buying by the case also keeps you on one production lot, so point of impact and velocity stay consistent from box to box. This case comes in factory packaging as 10 boxes of 20 rounds for a total of 200 rounds of 50 Beowulf 350 grain Full Metal Jacket Flat Nose.