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I've described how to develop loads with Superformance a few times. Predictably someone jumps in with "if there aren't published loads don't do it!". Which approach do you favour?
According to the burn rate chart Superformance is right between Hodgdon H4831 and Winchester Supreme 780. http://www.hodgdon.com/burn-rate.html
You'd think that's make it easy enough to figure out but the pressure curve and pressure time is unique with this type of powder. http://www.realguns.com/archives/196.htm
They seem to make a 129 gr factory load. If you wanted to use that weight you could always get a hold of a round and weigh the powder charge.
http://www.hornady.com/store/6.5-Creedmoor-129-gr-Interbond-Superformance/