Re: 6.5 creedmoor 129gr hornady sst super performance
I have not shot any loads that have used SP powder.
In gun rags and forums, all the hype associated with the SP powder indicates that accuracy is not on the real world results list. And match accuracy is not even to be mentioned.
There's more wrong than right (at this time, IMNSHO) in using SP in loads for the AR-10 style family of rifles. I'll stick with the powders that are winning matches and are appropriate for use in my AR-10s.
Best to you.
EDIT: They say it fits in the SAAMI specs for whatever.
I look at the graph and say,
"Ya got trouble, my friend, right here, I say, trouble right here in River City."
"... and it doesn't take the integral f(x) by separation of parts to figure this stuff out." Dr. Micah Chan