In my mind there would be nothing more wonderful and elegant than a O/U double, chambered in .303, made on the Boss platform. To my way of thinking the O/U goes better with small bores than a SxS. But, that's just me. Of course, one main stumbling block with regard to doubles in small calibers is regulation. Not that they cannot be regulated (obviously) but that, generally speaking, a person is more apt to want to have a number of loads at their disposal. Whereas in a large bore (a stopper, if you will, the double's main reason for being) it's basically one load (solid or soft...same weight of bullet, same conformation, same velocity), in a small bore a shooter is in want of several loads. Further, small bore rifles tend to be shot at long range (or, longer ranges), which is again problematic for the double. Were it me, I'd not be bothered by any of the above (one load, minute of grapefruit accuracy), but the market at large has come to expect something different (the whole matter of cost, aside). I am in agreement, though, @Velo Dog , were any of the major makers to adopt a small bore double, they'd be surprised by the demand. Truly, I think that if Bill Ruger were still alive he'd have one in the works, if not on the market, by now. Such was his way...make it, and they will come.