Pretty much everyone has weighed in...now for a newbie to respond. My first ever loads were 9mm loaded with Magnum primers. Didn't even notice the tiny red MAGNUM on the primer box. As recommended on the forum...I loaded just a bit lower, 0.1gr to 0.2gr, and fired them all without any issue. Of course I had to go back and rebuild my load ladder, as I would never continue loading magnum primers in standard cartridges intentionally.
Since then, and based on dozens of affirmations from this and other forums, I simple remove the primers on the press. Slowly...and without issue...and have re-used and fired every single one. I've even totally crushed primers, installing them sideways and other problems, and safely removed them on the press without issue. The only time I've "lost" a primer is when I installed upside down. When I deprime these (slowly) the anvil generally falls out. I always dispose of these now useless (to me) primers.
Another fellow wrote that he tried to explode primers by hitting them with a nail and hammer in the center of the anvil...and nothing. Seems the primers want to be hit from the bottom sharply.
Something else to consider...I have a challenge seating 45ACP primers...3-4 high primers per 100 (slowly lessening over time). These are hit hard by the hammer...and merely finish seating into the case. I cock the hammer and re-fire...100% success on 2nd hammer strike. So I can't see a slow decapping pin firing off a primer.