[Dr Strangelove]

20ga Hevishot #6 2.75" is almost all I use for pheasant and duck. I resort to #4's late in the season when the plumage is denser and extreme cold robs ballistics. The recoil is neglible with the shorter rounds. The 3" jobs out of a pump will smack her a bit. Try the medium constriction Terror choke. She'll be shooting circles around you.

I don't recommend steel in 20ga since most fast loadings don't exceed a 7/8oz payload, marginal in the 20ga.

For lead, I recommend #5 2.75". I also like Kent Tungsten matrix #5 for pheasant/duck as well.