The only really bad primer I've reloaded in about 40 years was a Winchester small pistol. I tried restrike, no boom. IIRC I poked out the primer and it had a good dent and appeared to be OK, compound and anvil still in place. I just thought "Hmmm, that's weird", and tossed it. I'm really surprised at how few dud primers I've come across in all my reloading, starting with a Lee Loader and using CCI, Winchester, Remington, Federal and Wolf primers all sized/powers.
One odd occurrence. I have an FMK 9mm that needs special care with Winchester primers. I would get one out of 8-10 duds. I tried other primed handloads, all went bang (CCI, Wolf, Fed). I tried the Winchester handloads in other guns, Ruger, Tokerev, and SCCY, all went bang. I knew all were seated properly. Gun was disassembled and cleaned thouroughly. I was doing some reading in one of my older texts and saw "sensitizing" primers, seating normally then adding some "preload" a little more ummph. I primed 100 mixed cases with Wincheter primers and "preloaded" all. I was using a ram prime so it was no big deal to add pressire to the seated primers. All went bang in the FMK...