Winchester spherical powders are known for their consistent burn rates and clean burning characteristics and are widely used for reloading shotshell, handgun, and rifle ammunition. As the name implies, this powder is designed to deliver optimum performance in compensated race guns. AutoComp has been formulated to help the compensator work more efficiently while it minimizes muzzle flash to help with rapid fire. Highly recommended for 38 Super, 9mm, 40 S&W, and 45 ACP.