For comparison I am getting 10 - 12 hits in 8" at point of aim at a measured 50 yards. At 40 yards I consistently average 27 hits in 8" at point of aim. I am using a Kick's GT choke at .670" that gives me about .053" constriction from my Benelli bore. Your Remington bore should measure about .729" and the .670" choke is about .059" constriction from your bore size. It's only a guess, but I would probably try a .665" choke and see if that tightened things up a tad with the 3" Wingmaster HD-BB or Dead Coyote T's. If it didn't... then go the opposite direction and look at a .675" choke. It is like searching for that perfect combination of case, primer, powder, bullet, bullet weight, seating depth, ect. for your rifle. I know you understand how aggravating that can be at times.
As to on game performance since doing all that pattern work about three years ago I've killed enough coyotes and fox to get a real good feel for it now compared to the No. Four Buck I used for years before. I like the HD-BB better. Under 40 yards depending upon how well your gun patterns you might not notice much difference. Having said that I think I do see a difference because I'm sending a bunch of those hard little BB's in a real tight pattern and they're just smashing coyotes. I hate to say it because I complain about it all the time, but I have misjudged the range and shot a few at closer to 60 yards than the 50 I'd like to keep my shots within. Sometimes ya gotta keep on the trigger and apply more tungsten, but they haven't let me down yet and the need to shoot multiple times with a shotgun isn't anything new. If a guy has no need to shoot far, then the least expensive route is the good old No. Four Buck in lead. From a good shooting rig No. Four Buck won't let you down either. If you want the absolute best bone breaking and deepest penetrating shot - then tungsten is it. That's my personal experience anyway.