IM,
I currently don't have a 28g that I'm using to hunt with. I do have a .410 . While the .410 is fully capable of killing cleanly the wild quail I hunt regularly, it has a way of stealing my confidence. So, I don't take it out often. I think it's all about confidence. If TT lacks confidence in his 20g (or any of us, in any gun/gauge) he'll likely have less success with it. My example of this is my 20g guns. I shoot primarily 20g at sporting clays and skeet and haven't taken a shot with a 12g in a long time. When it came time to go to So. Dakota for phez this year, I almost forgot to bring a 12g. First day out, I used a 20g 391 to bag a limit. On all the upland birds I hunt (phez, chukar, quail, dove) the 20g gives me complete confidence, probably because I shoot it all year at sporting clays.