First of all hello new to the sight. I'm blown away by your patterns guys! I haven't turkey hunted in a while and the last shell I used was winchester supremes #5s in 3 and 3.5" shells.
Ok I have a Benelli M1 that is my all time favorite shotgun and I have 2 barrels for it. A 28" M2 barrel i use for waterfowl, upland, crows and pigeons and a 24" with the mobile choke system i want to set up for turkey and I have a few questions. I tried the longbeards and they shot pretty good but poi was high. If I end up shooting lead which is probably what I will do it will #5s even if I have to try several chokes to get it shooting good. If I end up shooting HD shot I would like to try #7s if they are the equivalent to #5 lead in energy. The chokes I have are .655 terror and a .643 SSX truglo. The truglo didn't shoot as good so I mailed it to a fellow to have it reamed to .655. I have no idea where to start for #7s. Is it possable to find a choke that will pattern HD shot and lead well? I would also be open to #6 high density loads.
Now onto forcing cones... I'm not sure how I feel about this. I had ballistic specialities do a 3" in a Browning gold several years ago and they ruined my pattern. Before I sent it to them my patterns were hot in the center after I got it back they looked horrable. I hear Rob Roberts does it a little different and has good patterns with a longer cone BUT I'm still a little sceptical. Does your gun have longer cone and did you pattern before and after?
Thanks