Dr. Sane,
I have used a 20 gauge, on and off, for most of 40 years to kill all kinds of birds here in the midwest. Mr. Hill refered to the 20 as "Bitey" and preferred a 28, from my somewhat fuzzy recollection of his writings.
I always believed that if a 20 was "bitey" to you, you needed a heavier 20, or a lighter round of 20 gauge ammunition, or, maybe both, but, not necessarily a 28 gauge.
I'd just as soon not be beaten with a stick for that belief. I did shoot a really miserable round of skeet with a 20 gauge today, followed by a better one with a 12. I'm a little (lot, likely) rusty, and don't shoot my best when I'm shivering, anyway.
Happy New Year, Wonko. May your banjos all be in tune.
Best,
Ted