txhunter58
Just my thoughts but i use the .503/460 MT NEx in my GM barrels. I think this might be best fit for the Omega, but i am not sure.
As I remember the 460 has the best BC of the group (.202).
From the GM-LRH I shoot 90 grains of T7-2f, using a .125X.510 shot card to separate the bullet from the powder.