Ok, one last update for me. I hit the range again and have come away with two CO elk loads that shoot well in my Omega. The first is 410 gr Great Plains with 90 grains Pyrodex. The second, and the one I am going with is 338 gr Powerbelt Platinum with 80 grains of 777. I had 5 inch groups at 100yds with both loads. The deciding factor is that 777 is so much cleaner in my gun. There was no drop at 100yds for either load. I think I am finally ready go, which is a good thing since the season starts Sept 9th.