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. Excellent powder for loading 223 Remington because its lower flame temperature
helps extend barrel life. Works well in a broad range of rifle calibers from 222
Remington all the way up to 458 Winchester.
Sinclair, Issue:3B, Page:101