Originally Posted by
ebf
Ok, so you are pretty much focusing on "group size". Although as John pointed out above, groups of 1 kinda mean zip.
I would suggest you look at the speeds. Assuming of course you have a reliable and repeatable chrony.
Shots 5,6,7,8 are all within single digit ES from each other. It looks like a likely node in this ladder. Having said that, I would much rather look at SDs for 5 shot groups, the more data you put in the better the quality of the info you get out...
If (and it is a big IF), that is a node, then I would look at choosing a load in the middle, and playing with different seating depths. Shoot at least groups of 5. Do it at 100m and make sure the wind is not affecting group size.