Double charge is stupid, but if it overflows the problem is obvious. I do this, as he recommended; as an extra precaution.

He's feeling for the beginnings of a crack forming around the base of the case where the primer goes. It is especially apparent on high powered reloads like the 300 win mag, where the base skirt transitions to the normal case siding.

Casting can give you extra capabilities! They also have a metallized clay that can be sintered after forming!