Hodgdon Powder offers the largest selection of quality smokeless propellants for any reloading application. Now you can load your ammunition with the same powder that Hornady uses in their factory ammunition. Hodgdon Superformance was developed to for rifle shooters that reload for the 22-250 Remington, 243 Winchester, 300 Ruger Compact Magnum (RCM) and the 300 Winchester Short Magnum (WSM) and others (see below). This powder travels faster than most traditional powders. Superformance powder is a smooth metering spherical powder that flows freely through a powder measure. Designed for these Cartridges: 22-250 Remington 243 Winchester 243 WSSM 25 WSSM 300 RCM 300 WSM Warning About Smokeless Powder: Do not exceed the loads displayed in the reloaders guide. Never mix any two powders regardless of type, brand, or source. Never substitute any smokeless powder for Black Powder or any Black Powder substitute.