Hommer,
Been there, done that with the projectiles, I don't do it anymore, lifes too short!
Did the same thing measuring loaded round runout with a shit hot 222 I've got, trying to look for that last squeeze of accuracy out of it. Got into sorting into 1 thou runout increments and batching them to accuracy test.
Don't do that anymore either, doesn't matter a crap.
Although I should explain that... the difference that 1-2 thou runout makes is nothing, the difference that 5-10 thou does.

BTW, have you changed your signature now to "Hammer"??

David.