I load for the boss,he uses 22gram 7 1/2 from Hull Cartridges,the Pro 20 line.
Always through skeet and quarter choked guns.
I know you will be told that 7 1/2 shot won't kill game, well it does when he uses it! He will quite often shoot a third to half the final bag out of a team of 8 guns,left and rights on nigh on every drive. Last season on one drive on a noted Devon high bird shoot,3 times he had 4 dead in the air at the same time.
Chaps pegged either side couldn't believe the cartridges he was using upon enquiry, coupled with the open choked guns he uses.
Choice always comes down to what your guns patterns best with and what you're comfortable using.