Don, in threads where this situations has been discussed, several posters have claimed that the primer in the powder is an impossible situation in several brands and models of loader. The loader with which I have the most experience is the 800B in all four gauges. I have always explained to these people how it could happen with this loader. Thanks for the support. I have also explained how it can happen when using other models of loader. It can happen with any brand or model of loader if a live primer drops off the loading table into a box of empty shells. End of story, except the pressure testing. Sorry, I don't want to request to borrow anyone's test gun to bulge the chamber, which I expect to do before I am through testing. I would rather use the method of shooting defective shells in cheap guns until damage is observed. Send me the guns and I will do the testing and return the guns. wilmrph@verizon.net