I use the Winchester black box Supreme, I believe, 2oz, 3.5", #6, in my dedicated 12 ga turkey slayer. 870 SPS 26" barrel and Undertaker choke topped with a 42 mil red dot. I have shot a butt load of birds with this gun over the years from 2 yds to 53(and I swear to this day that bird was no more than 45, ranging through a thicket of sumac can do that sometimes and the bird was not staying any longer and it had taken the better part of a week to get that close to him) Only issue I have with this rig is I have missed more birds in close, 3-15 yds, as I sometimes forget in the heat of the moment to pull down where the feathers meet the neck or I will shoot over every time.
Last year I wanted a change so I bought a 18" Sinsinati in 20 ga from Corwin. Showed up the day before the opener, couldn't find a turkey choke or pattern anything in time so the LGS suggested I try the Hornaday Versatite turkey loads and recommended I used a cylinder choke. I come from the school of choke a turkey gun down so the pellets come out single file if you can so I did not have high hopes. I ate the proverbial crow that afternoon. These loads patterned as well as my 12 ga at 35 yds which was a 14" pattern with most of a 20 ga load of #5s in that circle with well over 20 pellets in the head, neck. I dumped two birds with that rig last spring. One at 26 yds the other at 37yds and not a twitch from either. All from a gun that weighs about as much as 3, 3.5", 12 ga shells LOL.
This will be 20 yrs this spring chasing these birds and I look forward to it each year.