I have not tried the 20ga, but back before Canada outlawed lead for waterfowl, I took a flat of 12ga 3" Fiocchi nickel plated 4s up to Saskatchewan for my annual prairie duck and goose hunt. This must have been 1993 or so. I shot most of the flat on the trip and was very happy with the results; that was a killing load. What I brought home I used for several years on Turkey. Great loadss...Geo