I don't use an ounce of shot in my 20s, and can report being quite successful on live game, up to and including pheasants. I hardly think 1 ounce of shot would be required for woodcock or ruffed grouse.
Having said that, I've never even used my 28 to hunt birds. Someday, I might. I'm still pretty sure I can avoid any need for a .410.

Best,
Ted