Especially in the 20 and 28, #7 is a terrific shot size for quail and grouse, as well as early season pheasants over pointing dogs.
As to loading #7 in the 28 gauge, I have found I get regular “bridging” of shot in the MEC 9000 I use. I still load it, but simply make it my routine to tap the shot tube with a screw driver on every down stroke. Otherwise, the shot hangs up about once or twice every 25 shells.
My single stage Mec 20 bridges with 6s.
