MEC presses have a scale which indicates the amount of pressure you're applying, but as Jerry Kaiser told me when I first started reloading,'if you have to crush a cushion wad to get it to close, you're using the wrong wad'.
Old Lyman loading books gave a 'recommended' pressure, but I honestly don't think it has too much effect on the pattern. I set my drop tubes to about 20-25psi.
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