50 AE – 300 Gr FMJ-FN – Underwood Ammo (509) – 200 Rounds

The 50 Action Express is one of the most powerful semi-automatic pistol cartridges, and owners want ammunition that keeps their big pistol running. This listing is Underwood 50 AE 300 grain full metal jacket flat nose ammo, MPN 509, sold as a 200 round case. It suits Desert Eagle owners who want to shoot more than a box or two at a time and those who enjoy big bore handgun practice.

Underwood rates this load at 1,580 fps with 1,663 ft-lbs of muzzle energy, which is far more than standard handgun cartridges and well into rifle territory for energy. The 300 grain full metal jacket flat nose bullet is a practice and target projectile that does not expand. Expect heavy recoil and significant muzzle blast. This is range ammunition for target work and handling practice, not a hunting load.

It fits pistols chambered in 50 Action Express, such as the Magnum Research Desert Eagle Mark XIX and earlier Desert Eagle models built for 50 AE, along with Desert Eagle conversion barrels in 50 AE. A common question is whether the Desert Eagle needs a particular ammunition power level to cycle. Gas-operated Desert Eagles are designed for full power loads, so weak ammunition can cause cycling problems, and a firm grip helps reliability. Another common question is whether 50 AE and 500 S&W are interchangeable. No. They are entirely different cartridges with different case lengths.

Underwood 509 is new production ammunition, not reloads. Cases are brass. This listing ships as 10 boxes of 20 rounds for 200 total, all from one lot, which gives you enough for several range sessions with a big bore pistol and consistent function throughout. Because 50 AE is a specialty caliber, buying a full case at once also protects you from periods when it is hard to find.