With its easy-to-load, sabot-free design, Federal’s B.O.R. Lock MZ™ .50 Caliber muzzleloader bullet delivers excellent accuracy and impressive penetration. The innovative B.O.R. Lock MZ™ System’s expanding polymer base cup grips the rifling with a tight seal to ensure maximum velocity and superior accuracy. Fouling-cutting rings on the B.O.R. Lock MZ™ base scour powder residue from the bore as the bullet is rammed home during loading. The result is consistent seating and less need to clean between shots, plus the loading force required to seat a Federal B.O.R. Lock MZ™ .50 Caliber muzzleloader bullet is about half that required for traditional sabots. The Federal B.O.R. Lock MZ™ .50 Caliber muzzleloader bullet’s solid lead 350 grain projectile has a polymer tip that ensures excellent expansion for a clean kill.