Did any of these DGJ articles deal with smaller bores when it came to the increase in pressure from shooting 1/4-inch longer shells?
Probably forty years ago now, I watched my friend the late Henry Thomas of Federal Oak Farm, Charles County, Maryland, shoot a round of skeet at the old Potomac River Gun Club with this 28-gauge hammer gun, that had been his father's, using factory AAs.
Richard 28-gauge.jpg
It is a Belgian gun marked RICHARD on the lockplates with Twist barrels.
In 1993, Henry gave me the RICHARD. I never fired it and when I left the Capital region I passed it on to a younger Charles County setter man who also knew Henry.