This thread proves the need for what I call a tactile gun museum.

A representative collection of guns, perhaps deactivated so there would be no legal obstacle to visitors handling, swinging and manipulating them, to get a tactile sense of each type. For withouth tactile sense, judging only visually, it is hard to distinguish what differentiates, for instance, a common sidelock from a worthy sidelock.

The last gun in the line up, one to experience after all the doubles, best or otherwise, would be a medium quality single barrel made by a second tier British gunmaker in the 1900-1920 era. You handle one of those and it will put the words handling and best in perspective.