Magnus Cowboy Bullets .38/.357 cal .357in 125 gr RNFPBB 500/ct. This mix gives you a lead bullet hard enough to be fired at 1200 FPS with little or no leading problems in most handguns but will not shatter upon impact with steel targets. Specifications for Magnus Cowboy Bullets .38/.357 cal .357in 125 gr RNFPBB: Manufacturer: Magnus Bullet Type: Round Nose (RN) Projectile Caliber: .357 Caliber Bullet Quantity: 500 Bullet Package Contents: Magnus Cowboy Bullets .38/.357 cal .357in 125 gr RNFPBB Magnus 513: Cowboy Bullets .38/.357 cal .357in 125 gr RNFPBB 500/ct