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Originally posted by whelenite:
The Superformance powder available to handloaders is not the same as used in the Superformance loaded ammo. The Superformance ammo uses custom blended powders specific to the cartridge being loaded.

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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.

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This is another of the spherical powders Hodgdon® Powder Company and Hornady® Manufacturing introduced to answer the frequently asked reloading question: "Can I buy the powder used in the Hornady Superformance factory ammunition?" Superformance delivers striking velocities in cartridges like the 22-250 Remington, 243 Winchester and 300 Winchester Short Magnum. Velocities well in excess of 100 fps over the best published handloads and even larger gains over factory ammunition! Because this propellant is tailored for specific applications, the number of cartridges and bullets is limited, but where it works, it really works!

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Light magnum is NOT the same load as super performance. Not by a long shot