I got 130 in 10" at 40 Yards with an INV+ BPS and 3" Win Sup HV 1.75 Ounce #5 Lead, using an Indian Creek .665 choke.
That choke in that gun has thrown awesome patterns with every shell I've tried.
It might just be awesome for you too.
The same choke and exit diameter in my 870 hasn't been quite as good, but still very usable.