Buffalo Bore Ammunition Buffalo-Barnes Lead-Free 454 Casull 250 Gr Barnes. This bullet will expand violently on flesh and bone and will penetrate roughly 24 inches depending on impact velocity and the particular bones that may be struck. This load would be ideal for deer and black bear. Even elk sized critters can be taken if you stick with broadside or CNS shots and avoid those bad angle shots. Specifications for Buffalo Bore Ammunition 7D/20 Buffalo-Barnes Lead-Free 454 Casull 250 Gr Barnes: Manufacturer: Buffalo Bore Ammunition Caliber: .454 Casull Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 250 grain Cartridge Case Material: Brass Muzzle Velocity: 1750 ft/s Application: Protection Primer Style: Centerfire What is Buffalo Bore Ammunition 7D/20 Buffalo-Barnes Lead-Free 454 Casull 250 Gr Barnes good for? The manufacturer suggests that it is best for protection.