When i bought my 835 it came with 4 choke tubes, Modified, Improved, Extra Full turkey, and one for steel shot only. I usually use the modified or improved when i shoot skeet and it does pretty well. I forgot and lef the extra full in one time, needless to say i never hit a single pigeon. Me and a friend decieded to see how tough or stupid we were and used 3 1/2 inch magnums in my mossberg to shoot skeet one time, that was an experience.

Dave

Ive been shooting trap for a while now i use a browning bps pump gun and i use a lead full choke, i find i powder more clays rather then just chunk'em. a steal modified is a lead imp cylinder this is a large patteren. the choke you have now wont have the range. i would go out and buy a lead full and lead modfied. start with a moddfied and then work up to the full. this should help your scores.