Superformance is available to the reloader. I'm using it to reload 30-30 but have yet to put it across the chrony to check speed. New to me caliber so I'll have to use factory data for speeds to compare to.
You are absolutely correct in the availability of Superformance powder as it has been out for more than a decade.
However, that one powder is not what is used in many of the Superformance cartridges that Hornady sells as they still use their own blends which are unavailable to the consumer.
https://www.hornady.com/support/faq...load/reload-with-hodgdon-superformance-powder
Second paragraph.