I shoot them all at the same target, and I mix up the rounds in the magazine.I was thinking about this last night, EddieCoyle, do you usually shoot your ladder test groups into the same target? When I do charge testing like that, especially at 100yds, it always made sense to me to separate the groups so that you could see the difference. I wonder if some the groups were noticably worse than others with the large primers.
I color the bullets with different colored Sharpies. You can't see it very well in the photo, but I can tell which hole was made by which charge weight.
(Except for the giant hole on the 2nd target, but I can tell which rounds are in there by process of elimination from the separate holes).