Loaded up the next progression - 51.0 to 55.0 grains of WC852f, in 1 grain increments. Groups were not horrible, but I did get some fliers...those might be all me though. In my haste to get loaded up for the weekend trip to the range, I failed to sort the Thumpers by weight (which I did on the prior test). I also switched my lube to 2500+. In retrospect, that might have been a mistake, since I am nowhere near 2500 fps. I will do some more testing, comparing the two lubes.
51.0 had potential, but there was a first round flier from the cold bore, and one additional flier that ruined the group. 3 shots in one hole though. 52.0 was the same. Wish I had weighed all the bullets.
53.0 - pretty happy with this one, as once again, there are 3 rounds in one ragged hole.
55.0 - although this isn't the best group, it certainly is sufficient...and a real thumper. This one hurts on the back end too. I won't be trying anything beyond this - I don't think it is necessary.
The uppermost holes are from the 53.0 group above. Looks like there is quite a bit of lube fouling on the holes - thinking the 2500+ might be too much of a good thing. Still have some lubed with Javelina that I am going to test again.