12.7x42mm (AKA 50 BEOWULF) 300gr FTX-20 ROUNDS

by Detroit Ammunition Company|Item # 1274230020


Out of stock


12.7x42mm (AKA 50 BEOWULF) 300gr FTX-20 ROUNDS

This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.

Manufacturer: Triple R Munitions
Condition: New
Bullet Weight: 300 Grain
Bullet Type: Hornady FTX
Ammo Casing: Brass
Quantity: 20 ROUNDS
Ammo Caliber: 12.7x42mm, .50  Beowulf
Primer Type: Boxer
Velocity:  1800 ft/s


Bill Alexander, of Alexander Arms, was one of the pioneers of big-game hunting cartridges in the AR-15-style rifles. He developed this cartridge and named it after Beowulf, a legendary literary warrior who slayed the invincible Grendel by ripping his arm off. The day after that battle, Beowulf fought the monster that was Grendel’s mother and killed her by cutting off her head with a mighty sword from her own armory; a sword of which it was said, “no other man could have hefted in battle.” Years later, when he was an old man on the decline and but a shell of his former self, Beowulf fought and killed a dragon.

The .50 Beowulf was introduced in 2001 and was the first of the big-bore cartridges designed for the AR-15. The cartridge is based on a lengthened .50 AE case with a severely rebated rim so it fits a bolt head designed for the 7.62×39 mm cartridge. Bullets are .500-inch, the same as the .500 S&W Mag.,

The .50 Beowulf bullet is half-inch in diameter and can expand to more than an inch. Compare that to a 55-grain .223 Rem. at .224-inch. The 300-grain Beowulf has 627 percent more bullet weight and an unexpanded diameter that is larger than a .223’s fully expanded bullet. Expanded, the Beowulf bullet has a 123-percent larger frontal diameter than the .223’s expanded bullet. The Beowulf has almost three times as much muzzle energy as the .223 Rem. and more than four and a half times the momentum. This is a serious step up in power for the AR-15 platform.


Additional information

Weight 1.50 lbs
Dimensions 6.0000 × 3.0000 × 3.0000 in

12 reviews for 12.7x42mm (AKA 50 BEOWULF) 300gr FTX-20 ROUNDS

  1. levisnyder47 (verified owner)

    Shipping cost hurts a lil but it was definitely fast! Idk where else a guy can order ammo on a Thursday and have it on his doorstep by noon the next day. I’ll for sure be back here to order again

  2. Roy Vanas

    Detroit Ammo co. RULES!

  3. Rick Pirtle

    Great service and good ammo

  4. Anonymous

    Good fast shipping great customer service

  5. Reggie bowles

    The guys here hands down are grate fast shipping

  6. Matt

    Well made ammo, good accuracy.

  7. Bill

    Don’t underestimate this round. It has plenty of power. Just make sure you know what is behind your target. I had been using some large logs staked together to stop and slow down my rounds before they impacted the dirt. Well long story short, toward the end of the shooting session, the logs had been chewed up pretty bad.

  8. Tom G.

    Great ammo for a great product. Very accurate, and worth the higher price tag.

  9. Jered W.

    Very satisfied, little bit pricey but well worth it.

  10. Matt

    I’ve used this ammo and it is awesome. Makes big holes and is very destructive. Will slowly buy more, just wish it wasnt so expensive. But hey, its one of my favorite rifle rounds

  11. Seth

    I am impressed with the rounds overall so far and am really happy that i have found somewhere to buy this rare ammo for one of my favorite guns to shoot. I understand it is an expensive round to make. I am hoping that as your demand grows for your product, and you begin to produce more, that the price will fall a bit. All-in-all you guys are doing a great job. Thanks.

  12. Sam, Alpena MI

    I love my Wulf! and I love this round. I was surprised when I received my order that these rounds were packaged in a reusable plastic box.

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