I own two 28 ga shotguns, but will never hunt with either of them.
I killed my first pheasant with a 28 gauge when I was in junior high school with a side by side 28 gauge. The shotgun was my father's when he was growing up. It was the first bird we flushed that day.
One of the fondest memories I had with my dad.
I'll second what oneounceload said about the 28 gauge.
As other's have said, reloading 28 gauge gets the cost in line, or a bit less with reloaded 20 gauge shells. There is less powder and shot in a 28 gauge shell.
When I was shooting competitive skeet, my 28 gauge averages were very nearly the same as my 20 gauge averages so I did not give up much. The first time I won my class at a skeet tournament was in 28 gauge.
I like 28 gauge, I guess.