RE: mod. choke
pattern it and see, so long as it is safe to shoot steel through your modified. i know it is for my benelli sbe2, and i too use a modified choke, but remington 4 shot 3 inch shells for duck and 3 1/2 bbs in winchester drylok steel for geese.
modified helps extend your shots further than more open patterns, i would think you can knock them down from a bit further than 25 yards.