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.
Sinclair, Issue:3A, Page:103