I duplex f over bbb and bb you really got to match the choke to the shot,factory browning mod gives a poor pattern i use a briley mod it gives me 75% @ 40 i use it for my 3'rd an long.We don't have anywhere near the #'s you got out there the biggest flock i've ever seen home is 4 to 500 birds we mostly jump shoot at long range hear but i wouldn't shoot steel past 60yds.It just doesn't retain enough energy out that far in my opinion thats why i put a little f in the mix hopin to get lucky lol .Cause 1 f can put the hurt on a goose,i did test some f only loads the patterns had a lot of holes in it.Ive got a new briley improved mod choke comin in i'll be testing that at 50/60 yds to see how it patterns i'm hopin to get a little more range with it we'll see....