I didn' t get very good results out of my Charles Daly 3.5" auto with the Rem. Choke Star Dot using 3.5" Win. HV #4s, 5s or 6s. I borrowed a Hastings .650 and found the magic with Win. HV #6s in 3.5" .
I believe the Start Dot Rem. is a .668 constriction so you might want to start with #4s or 5s.