X2 on chucking the primers after removal. The only dud I have ever had came from a reused primer.
I bought a bunch of primed brass from Lever in the 70s, It was all Boxer primed and I needed the 7.62x51 brass as it was hard to come by. It was surplused because the primers were defective. I did a bulk buy with two other guys and bought a 5000 round pack in ammo cans. We punched out every one of those primers in a RCBS JR press. The cases were IVI and all the primer pockets were crimped. Not one mishap or pop. One of the guys, took all of the primers as he didn't think there was anything wrong with them. He was selling most of the brass anyway and being super cheap, saved them for other cartridges. He was famous for getting a click when he should have gotten a boom. It really had a bad effect on his shooting.
I firmly believe, if we hadn't punched those primers and just loaded the cases, we wouldn't have had one misfire. Other guys I talked to did just that, one guy was loading for a 1919A6 converted to 7,62x51 and did thousands at a time. Removing them damages them as well as making them inconsistent. Just throw them away.