I have an Omega .50 SS fluted
I tried 175 gr Duplex Dead Centers.- 82 Yards. 2" group with 110 gr weighed 2F pinnacle powder - MV ave 1870 FPS.

I have tried a lot of combo's , best luck with 250 gr shackwave. 80 gr weighed 2F pinnacle 82 yards. less than 1" groups. but only about 1500 fps with my chronograph. I hope to shoot some more over the holidays. the pinnacle powder seems about 300-400 fps slower than T7.