I have loaded about 9k rounds of 9mm on my 550, and while I have had one likely overcharge leading to a Kb, I had not experienced a squib yet. But I'll start at the beginning. I was loading up rounds yesterday when I hear a click, and something fall behind my work bench. I then notice this- looks like I lost the pin the holds the Dillon sizing/depriming die together. I think. hmmm. I never could find it. though I am assuming it broke, and I never found it. anyhow, I'll call them tomorrow. since I really wanted to shoot today, I switched it out with the 9mm Lee die I have sort of kept in reserve. I pop the sizing die in and we're good to go. I load up a couple dummy rounds and they don't seem to go all the way in my case gauge. I then think its something to do with the 2 different brands of dies not playing nice together. so I decide to switch out the dillon crimp die for the Lee crimp die also. In calibrating the die, I believe I over-crimped the rounds, causing the 2 squibs out of roughly 40 rounds out of this batch I shot. I'm pissed that I was dumb enough to have 1 squib, and then switch to another gun and have it happen again. ugh. QUESTIONS 1. I left the dillon seating die in place, not feeling like switching it out for the Lee seating die. I figured all it does is seat the bullet to a given depth and there would be no functional difference between the two dies. this didn't contribute to my troubles today, did it? 2. Of course is possible that one or both my squibs have to do with undercharged loads/zero powder loads. To me this is unlikely, since I have gotten in the habit of checking for powder before I place a bullet, and the aforementioned 9k rounds of previous powder inserting success. Having said that, what happens when a 9mm with no powder is fired? does the primer have the force to sufficiently lodge the bullet in the bore? 3. also, the cases I ejected after the squibs occurred were pretty burnt up, which leads me to believe there in fact was the normal amount of powder in there. as previously mentioned, since I have no experience with this I don't know. 4. I hope my G17 barrel is ok. I always thought these popped out relatively easily, and I asked the range officer if they had a squib rod. well, it wouldn't just push out, so he takes a hammer and starts beating on the rod before I really have a chance to think about it. I guess thats what the gunsmith is going to try and do when I take it to him tomorrow, but still...I knowingly yet some yahoo pound on my barrel and didn't really voice much concern...I just wanted to get back to shooting. Obviously I didn't, as its jammed in there really solid. thoughts?