Originally Posted by meatyrem
Another thing that is interesting is the new suPerformance ammo for say the .280Rem is available through hornady. I made a call to them one day and they said they don't have loading info for the use of their superformance powder. So how can they have superformance ammo in he .280Rem and then not make available the powder they load it with? I can buy the powder but have no load data to work with to build loads in the .280Rem that they load the .280 with? Maybe someone can help with this one as well.
Reverse engineer it.
Pull the bullet, weigh the powder and see what amount they have in a few different shells. I suspect that you can then tweak it a bit and see what works well. I know this doesn't tell you what the max and min are for your 280 but it's at least a start.
In addition, the Hodgdon website has info on 2 loads for the 280, which will help a little bit.