Huh, I just started loading 10mm using Blue Dot, and I felt it was pretty consistent. With sampling every 15-20 rounds and loading about 200, my charge weight didn't vary by more than .1 gr on any sampled rounds. ALL were less than .1 off.
Is your powder measure smoothed and polished? Mine is like a mirror inside. Funny, I was thinking how much I like Blue Dot, and how decently it measured.
Good luck!
Ken