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Well, my most recent reloading oops was a couple days ago. Had not used the Dillon 550 for a few months and decided to crank out 300 rounds of 9 mm plinking ammo. Nothing special, 115 gr RMR FMJ, Win. Brass, 4.5 gr of ancient W-231 ( the price on the steel can was $4.39 ), and some S&B primers. Finished them up and took some out to the range to test in my 100% reliable Gen 1 Glock 19. About 1 out of every 3 had light firing pin strikes and didn't fire. So I had 12 duds in the box, along with 20 unfired leftovers. My son came over that evening and we cleaned the Glock, assuming the striker channel was clogged and took it out later that evening in the dark, just to see if it fixed it. Nope, still was failing to fire. Tried the 12 duds in my CZ P-09 and it fired all of them! So, I figured I needed to order a new firing pin spring. After I got home, I did some more thinking and double checked my primer supply and realized I had primed those cases with S&B small rifle primers. . The hammer of the CZ apparently has enough power to set off the harder primers, where the striker fired Glock doesn't. A good reminder to double check all your components before you start. Especially when loading on a progressive press. You can make a lot more mistakes faster on a Dillon!