Its not directly related to your question but superformance is a highly underrated performer in the 6.5 case. Used it quite a bit in that application. It is in my experience temp sensitive. I get buy fine with my load which is a warm load in the fall and winter months but i dont shoot it when it starts to get into the late spring, summer, and early fall.
On the magneto speed my charge moves a 123 gr bullet right at 3000fps which is something i cant get out of other powders and its accurate. Standard deviation of 9 on 5 shot groups.