This new spherical propellant was specifically designed for the 300 Remington AAC Blackout cartridge. It allows AR-style rifles to function normally throughout the bullet’s range weights, and it is ideal for subsonic reduced loads. In addition to being exceptional, it performs admirably in many smaller capacity cartridges, particularly in the 300 Blackout. varmint specials like the 17 Hornet, 17 Ackley Hornet, 218 Bee, 221 Fireball, and many others.more. It also performs admirably in the 6.8 Remington SPC and the 7.62X39 MM Russian cartridge. This fine powder meters like a dream and leaves no copper residue, extending accuracy for longer periods of shooting and making clean-up quick and easy. It’s a truly amazing new propellant!