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. An excellent choice for many handgun loads, 231 is ideally suited for 38 Special and
9mm but also works well in a wide range of other cartridges from 32 ACP to 45 Long
Colt. An extremely versatile and economical propellant.
Sinclair, Issue:3A, Page:103