This has worked for me for the last 15 of 17 years of chasing these addicting birds.
Rem 870 SP 3.5" 26" barrel with a Choate tactical stock.
-Longer barrel gives it a lot more reach than a 22" and the pistol grip stock is a lot kinder on my arthritic hands when holding the gun mounted for sometimes 30 or more minutes(no they do not all come running like the videos).
Undertaker choke
-tried several others but this one seemed to work/pattern the best. Please note if you are not used to these things pattern in close at 5-10 yds as well as longer ranges cause you have just turned your scattergun into a rifle at those distances. Mine patterns golf ball size and a little high to 20 yds. If I do not remind myself to shoot where the feathers meat the skin on the neck I will and have missed several birds in close(also part of the game, if you haven't missed a turkey you haven't shot at many) Now where this tight pattern shines is at a distance. From 20-45 yds I can saw down any bird that gives me a shot. Furthest bird I have shot, on the rangfinder afterwards, was 56yds.( to this day I swear that tom was not a step over 43yds but first light, a hen doing alarm putts in the decoys at 3 yds and a tree in front of me all led to the miscalculation) bird dropped in his tracks with 5-7 pellets in the noggin.
42 mil Red dot with green and red option
-can't see beads anymore and the red is for low light and green works for bright days.
Winchester Supreme 3.5', #6, 2ounce, the black ones
-I have tried literally every turkey load out there over the years and this works for mine. Get out and pattern is the only option but I enjoy making a good working gun into a turkey killing machine but that is just me. Please note do not assume a new box of same brand shell will work the same as the old ones. A few years back I bought a box of Supremes and over the next few weeks missed no less than 5 birds at various ranges. Thought I was loosing it and so did many of my buddies. I had two shell left from the old box and went out back put one downrange. Put one from the new box downrange at a different target and went to check. On the way down I noticed two different wads laying on the ground. Light bulb comes on.
Old shells bang on. New shells 12 inchs left. So guess what I do with every new box of shells folks