39.5gr of H322 with 180gr hornady ssp...it's dandy in my rimmed version using 303 british brass... n jis like dan's, is just under 2200fps.
you'd likely be far ahead to start with H322 n the 180 hornady for a work up. i know another feller that used it extensively in several contenders n xp's with great success, n he's the one that turned me onto it.
the maximum killin range of the ol "brush buster" will surprise you.

very nice set o xp's goin there!