Builder, I also have a 4 3/4 pound Belgium made gun, a nice little Francotte Knockabout ejector. It is uncomfortable to shoot with factory loads or my 3/4 ounce reloads. I installed my heavy .410 shot bushing in my PW 800B, which is somewhat less than 5/8 ounce, more like just over a half ounce. I left the powder charge alone to keep the pressure reasonable, filled the shot cup with a .410 card wad and loaded my shells just like a normal 28 gauge load. They are great little loads, no recoil and obviously low pressure. You can fill the shot cup with just about anything you can find that doesn't weigh anything, like a couple of pinto beans or a .410 card wad. I like soft fillers or pinto beans on top of the shot, but a hard spacer like a .410 card wad works just fine in the bottom of the shot cup.
