Here's my take 47.3 & 47.4 combined have 5 out of 6 with about 1/4" of verticle at 600 yards. Assuming the 9-12 mph in the notes meant crosswind. Not knowing if the 6th shot (high one in 47.3) was the slowest or fastest or in between. Pull out the faster or the slower and the SD probably calculates out pretty good, especially for fireforming!
It was a cross wind from L to R all the more reason to be confident in the up and left then down and right travel of the groups.
Out here where the trees are miles apart you are always shooting in the wind and after a while you can kind of spot when the wind got a hold of one.
These were not fire forms. I fire formed 200 after shooting this lesser with my other brass that I do most of my testing with.