I normally just use #6 hevi for everything. For years we have killed ducks and geese with #6 all dayout to 50 yards, no problem.

But when Rem quit with Hevi-shot, I got a bunch of #4 Hevi on sale, so I have been shooting it lately. Hammers ducks, and the only goose that stumbled into my spread this year looked like he got hit by a truck at 50 yards. Really nasty stuff.