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I assume there is more than one type of Superformance powder for Hornady's ammo.
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Yes, most likely a proprietary blend for each caliber or class of calibers, it's not uncommon for commercial ammo makers to use proprietary powders.
I have been trying to duplicate the Superformance 5.56 NATO 75 grain match ammo, unsuccessfully thus far, although I blame that partially on the lack of powders I want to try, namely AA2230.