Ok.. So here are the details... This is proof of how mistakes can compound.
I had made up a few dummy rounds (5) when I first got my press. When I say dummy, I mean primer, casing, bullet, NO POWDER.
Somehow (not paying attention), those dummy rounds got thrown into a box with 800 loaded rounds (different brass types). After a short while, my heart sank and I realized what I did.
So.. after a deep breath I took the box of loaded rounds into my living room and dumped them out on the floor. There I sat for 2 1/2 hours sorting the rounds into "like" casings. Once I had them all sorted, I pulled out my scale and began to weigh every one. I thought it would be easy to pick out any deviations, but I was reloading 9mm and only using 4.2 grains of powder. In the end, I ended up with about 50 rounds that were out of spec.
I took those rounds back to the loading table and began to pull bullets. Sure enough, about 40 rounds in I found all the dummy bullets.
Now this is where the story should have a happy ending... Unfortunately this is where I made my fatal mistake. Maybe it was my frugality (cheapness) but I didn't want to waste 40 projectiles and they only had some small dents where I pulled the bullets. I figured "Hey I'm just shooting them at a steel wall, it won't care if they have small dents". So I dumped the powder from those cases (just to be sure), re-powdered them all and began seating bullets. Yup I really did, didn't even bother to run the cases through the re-sizing die.
I put all those in a ziplock bag and figured I would shoot them first. Next day at the range, I made it through about 25 before I had the squib. I didn't really notice anything different about the recoil. Just that when I pulled the trigger after, it went "Click". I racked the slide and out came a casing that was completely black. I knew right there that something went wrong. I made sure to safe the gun, then looked down the barrel. Sure enough, the bullet traveled about 2/3 of the way down the barrel.
Many lessons learned.. Scared the crap out of me.