for me i had good luck with the winchester pumpkin ball style rifled slugs and the brenekke rifled sabot jobs... both shot good for me up in maryland out of a smoothbore gun.
with that said it seems like every gun has its favorite..
if you want to make it purr, you can pick up a rifled slug barrel with cantelever scope mount and then run remington copper solids through it. You will then be good out to 150 yards or so with sub 2 inch groups.
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