It's a mystery to me why the medium powders are all goofy while the Unique load so very good. I still think it's in the case but that doesn't make sense unless it is too tight and I'm overlooking something obvious. I want to find some 8 X 57 brass and re-work it to see if it acts different. Might be chasing the wind but I'm at a loss as to what else to try. I turned the necks thinner again when I suspected them even though they measured fine, but nope, that didn't make any difference.