I think you are on the right track on your opening post. A Model 21 or a BSS are both good choices. A couple of months ago we had a Vintagers shoot at our club and I shot my first ever round of sporting clays with a 21. We only shot 50 targets, but I broke a 35, which I thought was OK. I shot my skeet round with the same gun and did pretty good. The one I used was a 12 gauge, 28", straight grip, IC/M, ST. It handles nicer than any other gun I have shot. That myth about them being clunky or clumsy is pure bunk. They are without a doubt the best SXS I have ever shot with. And I have an old one I use as a beater when I hunt. Can't beat 'em. And like I said, the BSS is a great gun, too. Good luck.