Improved Modified .025 from 16 to 22 then Full from 23 and on back. The myth is that a more open choke is more forgiving, but the truth is that a more open choke merely has a weaker core pattern without putting any extra pellets into the outer fringe.
Depends on how your gun Paterns.....most guys like "Full" but I've seen Oakley shooters use Mod. I won an Oakleyv (30 yds / then 50 yds for a shoot-off) with a Mod......by mistake (thought I had a Lt. Full in). I've tried Mod. to Lt. Full at singles and .....slopiness aside...my Comp n' Choke Mod patterns best.