Thinking more about this, I just pulled ten .54 caliber 300 grain REALs out of the box I bought from Black Jack Hill a couple of years ago, and weighed and measured them. The weights ranged from a low of 293.2 grains to a high of 305.6 grains. That's a variance I would never accept with my home cast round balls. The top band diameters ranged from a small of 0.545 to a large of 0.554. I would not expect excellent groups with bullets like that.

Hey Devil. How about another test? Do you have a scale? If so, weigh your REALs, find five that weigh the same, and see what kind of group you get with them.