Don’t have the data anymore, but 2 powders stood out to me, RE25 and Win Supreme 780.
H1000 works, but my buddy who still has the rifle I built for him, swears by RE17.
I re-barreled mine to a 270Bee, the Pronghorn barrel sits in it’s sock. I will re-visit it one day, when powder availability improves.
I had nasty pressure excursions, but this was 20 years ago and powder selection was poor.