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smokeless powder and 750 FPS see below Product Details Details Caliber: 44-40 Winchester Type: Super X Cowboy Action Lead Flat Nose Bullet Weight: 225 Grain Muzzle Velocity: 750 FPS Muzzle Energy: 281 ft-lbs Rounds per Box: 50

Hi John and welcome. This smokeless powder cowboy load is rated for 750 fps and muzzle energy of 281 ft/lbs from a 5 inch barrel. Cheers, stay safe and enjoy!