As far as I'm concerned the "Weight for Gauge" works both directions. I see no value in either a 28 or a 10 weighing in the 6 to 7 lb range. A properly proportioned 6-6 lb 16 gauge is a neater trimer gun than a 12 of the same weight & will do anything the larger bore will do with comfort. It will do far more than a 28 of the same weight will do.
The old rule of thumb of a gun weighing 96 times its shot load is still not a bad one. This gives 4lbs for 3/4 oz, 6lbs for 1 oz & 7 for 1 oz. If the gun weighed more than 5 lbs I would personally prefer it to have a bigger hole than a 28 & if it weighed less than 8lb I would prefer it to be smaller than a 10. This is of course just my personal preferences
