"not so much the "deck" height but the flange on top of the holder, thinner would allow the case to be pushed up farther into the die yes? and would that not allow the case to be sized a bit farther down?."
The "deck" is the flange. No matter the other dimensions, all shell holders are specified at 1/8th inch (.125") depth and all sizer dies are made to work to that.
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