Good thought. My Square Deal B always needs a good shove on the handle to be sure it's fully seated the primers.
Lay a thin straight edge across the primer pocket and a narrow strip of onion skin paper or aluminum foil should slide between it and the primer. Ideally 3 thickness of standard weight foil should fit (what I have is all around 0.0008" thick), but one thickness tells you that at least the primers aren't standing proud.
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