With smokeless, you may be in new territory because the capacity is enormous compared to plastic or even paper, the inside dia. is much bigger as well. I don't believe that you can use regular plastic wads as they are not wide enough. Even alot of 12 ga. felt and card wads should be measured first. I also don't believe you can use loads out of manuals unless you find some loads for brass cases. I've loaded and shot alot of shotshells with brass cases, as they are meant for BP, where you load in 80grs of 2fg, then a card wad and enough felt wads to build your wad column to the correct height that the shot and then a final card wad, will bring things to within 1/8" of the mouth and you can seal it all with a bead of glue from a glue gun. I found it best to cut my own wads for a good fit..note that 80 grs of 2fg is barely 2 3/4 drams and a speed of about 1100fps.