OK, so here are the results!
Conditions 30 degrees F, 9mph from 2 o'clock, gusts to 14mph
Hornady cases 3x fired
Fed 215
175gr ABLR
65.5 gr of both IMR7828 and IMR7828ssc
Shots were alternated starting with 7828, then 7828ssc, and so on.
IMR 7828
Shot 1 - 2886 fps
Shot 2 - 2863 fps
Shot 3 - 2869 fps
Average - 2873 fps
IMR 7828ssc
Shot 1 - 2891 fps
Shot 2 - 2863 fps
Shot 3 - 2860 fps
Average 2871 fps
So there you have it! Despite the small sample size, I see no significant statistical difference between the two. I was not concentrating on grouping because it was frickin' chilly, but the six shots grouped about 1.5".