Going to try a 20 gauge this year, if I can find some good Tungsten shot/ammo.
I've used a 20 exclusively the last 5 years-- Federal Heavyweight #6s-- plenty of pattern density and energy to 40 yards!
I hate to spend the money, but I'm going to give Apex Ammo a shot (pun intended) this year.
Apex always sells out, like now, on most of their ammo line. I use Federal Heavyweight TSS 3" 20 gauge # 7 or #9 out to 55 yards with killing results, and they are cheaper!