I made several posts about my Dillon 650 and the fact that it has crushed primers and detonated the primer stack several times, leaving holes in my ceiling and my ears ringing. 650.
I received a lot of ridicule and flack about those postings stating that I must be the only person in the world who has ever had such a problem with a Dillon
I now know, for a fact, that many, many others have had exactly the same problem. I was doing a search for the best reloading machine, better than a 1050 if possible and I ran across many comments by people that have had crushed primers in their 650, some of them blowing up in their face. Only Dillons design saved them from serious harm, only luck, in my opinion, saved them from great harm. The 650 design somehow allows primers to turn sideways and be crushed upon the next stroke of the lever. Only luck prevents the primer from going off. This appears to be a design defect and is not related to the users operation of the press. I have had the same problem loading 0.308, but at much less frequency. I have had shells, loaded with a primer crossway's and partially crushed, make it all the way to the final loading. IE it was possible to set off the primer with a full powder charge and a bullet in place, inside the bullet seating die or the crimp die or in between. I suspect the bang would be much louder with the bullet inside the die if the primer went off.
Bottom line, the Dillon 650, in my opinion, has a serious defect that may cause serious harm to the user. Dillon needs to correct this before someone is seriously hurt.]