OK, now I'm confused. (A not unusual situation, by the way.)
Bigjack, did you mean a .50 bullet, or were you talking about a .54 caliber bullet, in a .54 rifle, propelled by .50 caliber Pydrodex (or other) pelletized "gunpowder?" And Clayfish, assuming we're talking about a .54 ball and .50-sized powder pellets, does that have any effect on accuracy?
Thanks.