I bought a Savage Stevens 28 gauge 555 compact last week. I wanted a little more pepper than my .410 sxs offered for rabbit hunting. To be honest, I was slipping (missing shots) in some of the thicker stuff we have been getting into. I carried my 20 gauge 11-87 a couple weeks ago and an hour in was really feeling the extra weight. I searched for a sxs 28 gauge but settled on the 555 o/u in "compact". The barrels are only 24" which are a perfect length for rabbits. The stock had more of a youth model feel, but I put a limb saver recoil pad on and the LOP seems just right with the clothing I wear to hunt.
I had it out yesterday and fired two rounds with two bunnies in the pot! I am very satisfied with it so far. It's not a very attractive o/u, but it's a dedicated rabbit gun, no place for a thousand plus dollar gun. I found several offerings of shells like mentioned, I bought four boxes of #5's and four boxes of #6's from my local store for about $12 a box. It was an Italian brand I've never heard of (not Fiocchi) but they seem to be of good quality. I will tell you, I asked a gentleman in a gun store and he said 28 gauge only came in 2 3/4" chamber, but I've seen 3" 28 gauge shells on the shelf too, so.......