You will want some calipers to measure OAL. If you are deatil oriented and patient, the scale that comes with the Lee kit will work fine. If you are less of the above, maybe getting an RCBS 505 or Dillion Eliminator would be a good investment.
I mainly shoot 240gr Elmer Keith style lead semiwadcutters (240gr LSWC) out of my .44RM, Missouri Bullet Company or SNS Casting are good sources.
I prefer Accurate #9 for full power .44 loads. It will get you right up there with H110/W296, but is less finicky and downloads (when you want to slow things down some) really well, something H110/W296 does not do well.
Use magnum large pistol primers.
Good luck, have fun.
When asked what qualities he most valued in his generals, Napoleon said, "give me lucky ones."