I also second the 52 gr. Speer HP as a great one in the 22/250
Although you mention 55 gr. bullets, IF you wish to try the lighter ones, the 40gr. Sierra HP is good; also the 60 gr. Sierra HP is a good heavy one as well.
IMR 4064 and IMR 4895 are great all around powders but not great for volume loading per powder measures..for measures, try Ramshot TAC and Big Game
