Winchester 2 3/4" HV Supremes in #4 shot. I' m shooting a Browning A5 with a 30" full choke barrel and it' s deadly. I just killed one yesterday afternoon at 40 yards and he hardly even flopped.

As far as the #6 shot, they have killed a many a bird, but I hit birds with them on two different occasions that didn' t stay down. On one of those occasions I had called in 3 longbeards and would have easily doubled had the first bird stayed down. He didn' t and while I was finishing him, the other two got away. After that, I switched to #4' s. I' ve killed four birds with them, 2 at 40+ yards, and all four have gone down like a ton of bricks, hardly even flopping. I highly recommend the extra energy you get from the larger shot size. #5' s work very well also, but the #4' s pattern better in my gun, so they get the nod.