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  • Umarex Speedbelt™ .50 Cal
  • Umarex Speedbelt™ .50 Cal
  • Umarex Speedbelt™ .50 Cal
  • Umarex Speedbelt™ .50 Cal
  • Umarex Speedbelt™ .50 Cal

Umarex Speedbelt™ .50 Cal


$ 24.99

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The revolutionary Umarex® SpeedBelt™ ARX® muzzleloader round features the patented ARX® bullet design, a non-expanding, non-lead projectile that is lighter, faster and hits harder. Its fluted design ensures exceptional reliability and terminal performance that transfers extreme energy to your game.

The ARX bullet is a universal hunting projectile. The Umarex SpeedBelt bullet reduces recoil and loads easily in muzzleloaders with no lubrication required. The projectile is injection-molded from a specially engineered polymer-copper matrix that is designed to be tough enough to penetrate soft tissue.


The Umarex Speedbelt™ ARX® is the next-generation of muzzleloader hunting ammunition. Through advanced design and materials science, the ARX uses a specially engineered polymer-copper matrix that uses fluid dynamics and non-expanding surface area instead of expansion to achieve terminal performance.
Patent No.: US 9,841,260 B2


The ARX® Bullet is designed with unmatched energy transfer that disperses kinetic energy both forward and laterally producing excellent knockdown power. Hydraulic displacement produces terminal wound channels rivaling and exceeding traditional expanding bullets. After entering soft tissue, the specially designed grooves in the nose of the non-expanding ARX bullet constrict, pressurize and eject fluid at 1.5 to 2 times the directional speed of the bullet.


Injection-molded ARX® projectiles deliver exceptional accuracy and performance in muzzleloaders.* 


The Umarex SpeedBelt™ ARX® is lead-free and shoots clean in muzzleloading systems. Its performance engineered polymer belt (base-cup) is made of leading polymers to both withstand the blast of a muzzleloader and engage with the rifling of the barrel.


Barrel bore diameter and powder used may cause variations in performance.
The SpeedBelt cup outside diameter measures .509" and tapers to .504" at the nose of the cup. The black powder blast flares the cup to create engagement with the barrel.
100 grains of Pyrodex produce 1,845 FPS and 1,450 ft. lbs. of energy at 15 yards.

ARX® is an U.S. registered trademark of Quantum Ammunition, LLC.
Find more information about ARX Bullets, Quantum Ammunition and Inceptor at:

* Performance may very with barrel bore diameter and powder used.


View other Products in this Category:

50 cal, 50 caliber, ammo, ammunition, ARX, muzzleloader, Speedbelt, Umarex, under-25

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