I went ahead and loaded up a bunch of the partitions in with 3 different powders I had that would work for .223 according to the load manuals. I also loaded up 64 gr Winchester Power Points also. The powders I used were W748, Varget, and H335. It was about 75 degrees with the wind gusting from 5 - 15 mph. Just for the heck of it, I shot some of my pet loads of W748 and 52 gr SMK's for a baseline. I think the wind pushed the bullets around a little bit, but I still had a respectable .54" group. This load can do as low as .2" (Best with this gun) with a 5 shot group. So I also took that into consideration. Here were the results.
60 Gr Partition (Powder: Best Group Size, Center to Center)
Varget: 1.43"
W748: 2.9"
H335: 2.24"
64 Gr Winchester Power Points
Varget: .87"
W748: 2.45"
H335: .96"
As you can see, I am leaning towards the less expensive, better grouping 64gr WPP. This will be used for Ag/Herd control deer. Shots will be taken carefully. I feel I am an excellent marksman, and would not take shots if I did not have complete confidence in myself and my weapon.
I should also note that no re-zeroing will be necessary.
The smk's are sighted in right at 2" high at 100yrds. The 64 gr WPP's group 1.5" high and about .5" to the right (approximately). That's pretty good in my book, considering the group size.