The connoisseur's shotgun bore and the shell that upland hunters and skeet shooters speak about with a reverence bordering on the religious. It is light and sweet and kills far above its tiny payload weight in the hands of someone who can actually shoot. Expensive and beloved and just a little bit snobby in the best possible way. A gentleman's gauge.
Loads run light birdshot offerings almost exclusively. Priced well above the 12 and the 20 because refinement never comes cheap. Comes in small boxes so the deals reward the shooter who watches for them.