As I ponder the reality of semi retirement, the current economy, and the future generations of SXS collectors and shooters in relation to the safe full-o-guns and the investment they represent I have come to the solemn conclusion that haveing only one gun is an impossible consideration. Here is why. Grouse hunting IMHO requires an open choked, straight stocked gun of no larger than a 20 guage or a 28 or better yet both. Pheasant's rain from the sky via a bevy of 16's and 20's. Rabbitts roll through the powdered snow after meeting a charge of 6's from any of the above mentioned guages. My go to SC gun is a GHE 16 skeet.
While I have several 12's (I'm really not a 12ga person) my favorite is a grade 3 hammer gun. The one guage I could live without however is the 12 but living with only one shotgun is impossible. Now don't get me started on rifles