I've been shooting 2 3/4 inch American shells in 2 5/8 inch chambered 12-gauge Ansley H. Fox doubles for 41 years and my Father and Grandfather were doing it with even a twist barrel Parker Bros. of 1890 vintage, a Vulcan Parker Bros. of 1902-vintage and a Damascus barrel Remington of 1896-vintage for half a century before that. Those three guns, all fairly heavy 30-inch barrel guns, have probably digested a boxcar load of Federal Hi-Powers and Super-X type shells among them.
That said, for clay target shooting I use 7/8 ounce loads at 6300 psi, but I'm certainly not opposed to the use of a Super-X where called for in guns of suitable weight.
