The other day that I was setting my primers in, each round I did I kind of cringed a bit halfway preparing for the primer to go off.
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In all my years, and tens of thousands of cartridges loaded, I've never had this happen.
I have set my stool on a primer, and had it go off. It make a permanent mark in my wood floor, a not so permanent mark in my underwear, and caused my ears to ring. IIRC it was a CCI Small Rifle Magnum I use for loading .30 Carbine.