Re: hodgdon superperformance powder
I have the new 2011 Hodgdon's annual manual and they do not have any load data with Superformance for the 308 Win. From what I read this powder "is tailored for specific applications, and number of cartridges and bullets is limited, but where it works, it really works!" They have a good right up on this powder in the manual but do state.
"Don't experiment with any cartridge that we haven't tested extensively in our lab. Only certain components combination will yield the improved ballistics we're touting for this propellant."