RE: What slugs do you use?
Of the guys shooting smoothbores in our bunch, regular Brennekes get the nod and all are accurate out at 100 yds. 2 Benellis, 1 1100, 1 Winchester pump, 1 Mossburg pump.
Rifled barrels, Savage bolt with Lyman reloads, 1 A5 with Remington Copper Solids, (Hastings says no but he's too cheap to forego the 3 or 4 boxes he has), 11-87 with Lightfields.
I use Hornady H2K sabots which are about 10 bucks a box, but they let me take advantage of the open field and 5 H2Ks will shoot inside a 3 inch circle at 200 yds. 1100 with old Hastings barrel has nailed 7 deer in last 3 yrs. between 100 and 200 yds.