I was working up max powder charges for my 6.5x47 and had a little mishap. I had already worked up for rel 15 and a berger 130 vld so I wanted to see what charge would be max for varget. I'm shooting 130 coated vld's. I loaded 40 grains of Varget, and shot over a chronograph. Everything was perfect! I moved up to 41 grains, and shot over chronograph, and got a reading of 3180 had a light bolt lift, but it disintegrated the primer!!! Now I knew 40 was good so I loaded up 3 more at 41, and everything was perfect my chronograph reading was 3169, 3175, and 3180. What do you think caused the primer to disintegrated like that????? Also to note the one that blew the primer pocked had stretch so far that it would not hold another primer, but the other 3 shot at 41 were tight and snug.