I emailed Federal, they recommended using a standard full choke for their 20g Heavyweight loads, I shoot the 1½oz #7 Heavywieght loads in my 20ga TDC for Turkey, with a Trulock full, I get exceptional patterns at 40yds, tried a load in my 20ga Pardner modified, 30yd pattern would make a tom very dead.
My Huntin parter shoots 3" 12ga lead Flitecontrols in his Mossy 500 thru an extra full turkey choke, he gets great patterns at 40yds. One thing about the Flitecontrol wads, they fly much further than conventional wads, we've found them anywhere from 35-45yds away, sometimes past the target at 40yds, most fall about 5yds short of it tho.
Tim