If you have or can find some Federal buckshot with Flitecontrol wads give then a try - I patterned their 12 ga 00 law enforcement version a few years ago in three different shotguns and was impressed.
"Rem 870 Police Magnum, 20" Improved Cylinder, rifle sights. Overall best performer.
Rem 870 Magnum, 20" Cylinder bore, shotgun bead. Patterns tended to be high, centered above point of aim. In some case entire pattern was above POA. Guess that isn't a big surprise with shotgun bead for sight.
1st generation Ithaca Deerslayer, 20" minimum diameter straight bore barrel, rifle sights. Nothing special, patterns similar to the 870 with Cyl Bore and Bead, except centered more to point of aim.
Federal Law Enforcement 2.75 in 00 flitecontrol loads worked as advertised. Tight patterns (4 to 8 in at 25 yds) with all 3 guns. Tightest was the Police Magnum."
