The Powerbelt Copper Muzzleloading Bullets 50 Caliber Hollow Point is one of Powerbelt's most popular muzzleloading projectiles since the roundball and truly are “the bullets that made sabots obsolete.” They are #1 for a reason, and if you don’t believe Powerbelt, ask any hunter who has shot them. The thin copper plating greatly reduces bore friction for higher velocities – while still allowing for optimal bullet expansion within the rifling grooves.