Was it known that the shell was a reload the entire time? Looking at the obvious signs of over pressure, the way the primer flowed into the area around the firing pin is classical, the way the hull rim expanded into the extractor area is the same.
Are we certain this is a reloaded shell? One problem I have with low pressure reloads is that they often dont take up enough room in the hull. So if extra anything gets in the hull, that extra space just gets filled in and the crimped shell can look normal. People think all over pressure loads are double charges of powder but they do not have to be that much extra powder. Makes you think of how lucky we are in our reloads. Ive loaded several hundred thousand shells with no graphic failures like this one. Worst for me is the odd cocked wad or squibs loads
I had a PW machine which would create an overload problem in 20 gauge. Talking with one of the fellows at Alliant I was told using Green Dot, my all purpose powder at the time, four to five grains extra powder would cause pressures to climb quickly in dangerous ranges. I sent that machine back twice to PW who went over it. It still had the same problem so over the side of a bridge it went.
