Back when we killed them by the 100's we learned to only shoot BBB. We killed some at some long ranges too. We only used steel. I'm sure the new Hevi Shot loads are probably much better. I think the Black Cloud work pretty good too. When they first forced us to steel shot we all went to 10 Gauges. In those days we could only find the old Mossberg bolt actions that we had to get rechoked for the steel because they only had full chokes. Then as the 10's became more in vogue we went to the Browning BPS with the screw in chokes that was quite a step up. We killed a lot of geese with those cannons. We were on a good spot one day with a friend who had one of the new "at that time" Benelli Super Black Eagle 3.5" guns. We were killing lots of geese and he couldn't kill anything, so I took his Benelli and let him use the " Magic 10". It turned out that I still killed just as many as with my 10, and hes till couldn't hit a thing! I decided then that the way lighter Benelli was the way. I found a Super Black Eagle 2 a few years later on Gunbroker for a good deal and never looked back. Still got that big 10 though, I tried packing it for turkeys a while back and couldn't believe how damn heavy that thing was!
