fusion, I'm not sure if you're still looking for suggestions but absolutely try the Harvester Crush Rib. I've shot those 250 TEZ in about every sabot I could get my hands on and every single time, regardless of the gun, the Crush Rib shot best.
I will say, I am in the south though so the humidity may or may not have something to do with it.
The sweet spot from a powder charge was always between 80 and 90 for me.
Hope that helps