Looking for the sweet spot for your Umarex Hammer ammo choice? Look at the UX SLA 350 grain slug from Umarex. This monolithic slug is made from soft lead and has a flat tip and base which optimizes it for use in the .50 caliber Umarex Hammer high pressure big bore air rifle. With a true diameter of .510 inch, this hard hitting 350 grain slug is the perfect choice for dumping all it's energy into soft bodied targets.