Buffalo Bore Ammunition Heavy 44 Rem Mag 300 Gr Semi Jacketed Flat Point. 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. Specifications for Buffalo Bore Ammunition 4B/20 Heavy 44 Rem Mag 300 Gr Semi Jacketed Flat Point: Manufacturer: Buffalo Bore Ammunition Caliber: .44 Remington Magnum Number of Rounds: 20 Bullet Type: Semi Jacketed Flat Point (SJFP) Bullet Weight: 300 grain Cartridge Case Material: Brass Muzzle Velocity: 1300 ft/s Application: Protection Primer Style: Centerfire What is Buffalo Bore Ammunition 4B/20 Heavy 44 Rem Mag 300 Gr Semi Jacketed Flat Point good for? The manufacturer says that it is suitable for protection.