Buffalo Bore Ammunition 4B20 Heavy 44 Remington Magnum 300Gr Handgun Ammo - 20 Rounds - This heavy 44 Magnum field-proven pistol and handgun ammo offers maximum firepower ammunition. It is designed for super deep penetration at revolver speeds, but will mushroom and penetrate less deeply at rifle speeds. This equates to a solid 3 feet of penetration in muscle and bone and at rifle speeds roughly two feet of penetration in muscle and bone.