ORIGINAL: Pittsburghunter
Welcome as well!! I will give you a base load assuming you can find what I like. I will give you the substitute bullet right now, 250g Shockwave. I like the Hornaday 265g flatpoint (.429) with the right sabot. In your rifle I would use 110-120g T7 FF (loose) any primer you want and one wet one dry patch between rounds. On a bad day you get three inch groups with the Hornaday 265g Interlock flatpoint. just my cent and a half.
I'm assuming the "right sabot" for that 44-cal bullet is the MMP you're using. I've had no luck with 5-shot groups using the Harvesters at 100 yards with less 777 powder than what you listed.
It drove me away from shooting 44-cal bullets. I now stick with the MMP 40/50s and Harvester 45/50s.