So I ran out of primers, went to grab a couple more with the tube and when I put it back on ran the slide and then it went off only thing I can think of is one hung up when I thought I was out and slide it into place and then some kind of way put another one underneath after filling the tube back up. I’m not sure how I did it. But I do know what you’re talking about when it comes to the amount of force you can apply. I don’t know I’m 100% sure it was the operator fault just wish I knew exactly happened to prevent it from happening again. Just thought I would pass it on and even though you might feel like you don’t need to wear safety glasses myself included it’s a good idea to wear them because you never know.Weirdly enough, I was just priming a couple of hundred cases, and after not using the thing in a while (and because the thing makes it so easy to seat them), I was telling myself "Whoa tough guy, don't want to blow a primer indoors"...
Not saying @K80/6.5 is guilty of it, but double feed or not, I could see how someone could easily go full ham-fisted guerilla and blow some.