Just some notes after looking through a bunch of old Turkey load patterns...
In my 3" 870 with 28" Barrel, my best patterns have been with:
Factory #5 Lead Loads - Indian Creek .665 (Also Factory #5, #6, and #7 HTL)
Factory #6 Lead Loads - Ventilator .655
#6 Lead Reloads - Indian Creek .675 or Ventilator .655
#4x#5x#6x#7.5 Lead Reloads - Ventilator .655
(I have a Kick's GT .650 that eats light loads, but I haven't run any Turkey loads through it.)
In my 3" BPS with 28" INV+ Barrel
All Factory Lead and HTL Loads, and Lead Reloads - Indian Creek BDS SS .665
Every Pattern with Every Load has been rock solid. 1 Choke, Regardless of Load.
If this was a dedicated Turkey gun, I could glue this choke in place and forget about it.
The 870 combo varies, but the BPS combo is constant?