Dont use any choke tighter than modified. Ive seen a couple pictures of what can happen with a full choke and steel,, not pretty. It CANrip the end of the barrel right off!

I use Fasteel 3" #2's at 1560 fps with a modified, keep all my shots under 35 yardsand very rarelyare follow-up shots required on ducks.

If you want too shoot 40+ yards,, stick with the hevi-shot,, price will be about the same per bird because you are going too expend alot of shells on cripples!