Federal Premium 454 Casull Ammo 300 Grain Swift A-Frame ammo review offers the following information;Quality hunting ammunition designed for maximum performance and reliability. Premium hunting bullets are matched with select powders, primers and brass to create a reliable, hard-hitting hunting cartridge. Loaded with the Barnes XPB pistol bullet, this load will deliver more energy than any other bullet available for handguns. In testing, penetration has been increased up to 25% over lead-core bullets, while remaining intact to expand like no other bullet in the world.