Just FYI, if you set primers in cases like I do, with a hand press, the large/small primer issue is easier to detect and deal with before you try to crunch the large primer into the small hole. It's a touch thing, those of you who have done it will know what I'm talking about.
Last batch of ~250 pieces that I primed contained 9 small primers. I used to throw them away, now I save them out and prime them separately. Not a big deal.
Is there any reloader who has not accidentally crushed a primer without a resulting fire or explosion?
Not sure exactly what you are asking, but I've crushed plenty (dozens) of them sideways into the pocket and have never had one detonate.