Found two nodes......
38 grains had an ES of 3
39.5 grains had an ES of 7.
Next up.....showdown betwixt the two......
I loaded up 20 of each, and gave them a go at 100-200-300-400. Virtual tie that day, each "winning" 2 yardages, in less than ideal winds.
Went out several days later in better testing conditions.
38 grains:
200).560"
300).820"
400)3.100"
500)3.350"
39.5 grains:
200).1.230"
300)1.870"
400)1.180"
500)1.465"