I never used to have this problem, unless I was reloading brass with crimped primers. Military brass I had to chamfer the primer pockets. Now it seems like I run into this occasionally with commercial brass also. For years I used the Lee handprimers with no problems. Lately I've run into it with some commercial Federal /223 brass. Even some Winchester. Broke my Lee primer tool so I went with an RCBS bench priming tool. Sometimes I really have to lean into it, even after chamfering. Had a buddy that was having problems with 9mm brass (don't remember what brand) this summer. Now I'm reading others seem to be having this issue too. Maybe it's not all OUR fault. Or our equipment. Maybe we're seeing a relaxing in tolerances.??