You want the nitro card a tight fit and yes it will be harder to push in because it's hard unlike the cushion wad. The OS wad is just finger tight. If you don't want as much roll over with the crimp, add a bit more cushion wad by slitting them to get the correct height. With my old measure, it shows a 1 1/4oz oz shot and 3dr load [ equal amounts of shot and powder by volume ]. Your 4 1/4 dr would be a 1 7/8oz load. Where you just trying to get the correct height by adding more powder ? It's cheaper [ and less recoil ] to change the height of the cushion wad. My roll crimps vary from .060 to maybe .240 - haven't measured one in quite awhile. I use a Mec Jr to reload BP and the nitro card is pushed in hard over the powder, then the cushion wad, then shot. If the shot isn't with in 3/8 of a inch from the top I dump it in a empty shell, add a bit cushion . From then on you'll know what's needed. Hope I've helped you some .
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Paul Harm
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