I've decided to fire lap my new Marlin cause all I can get is 3" groups at 110 yds. After I order the lapping supplies (ie. bullets, seating screw, compound, etc.)to load up about 50 rounds, I'd like to get a powder charge using either Unique or Herco that I have on hand. Reason is I don't want to shell out for a whole pound of powder that I'll only need a fraction of. Any help would be appreciated.