Its more of a personal preference.....20# is almost as good as 12#..... However, for waterfowl, if using 20#, chances of winger are more so choose right choke and load...it also depends on distance the bird...Places where duck shows up nearby, 20# is light and fun, however, for distance shooting 12# is better..... Also, arrival migration ducks have less fat on them, whereas return migration, ducks have more fat so you need penetration power.
my wife uses 410# for upland and duck....Choke & load varies.
personally, i use 20# for upland and 12# for duck
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