RMC's Baker, if he is an experienced loader with the PW 800 series, is the classic "primer in the powder" type of blowup. A double powder charge would be extremely unlikely. However, when such an accident happens, step one is to dismantle all remaining shells to weigh the powder charges and look for other signs of problems. I don't care if I have 100 more loaded shells in the same lot, I will cut them all to pieces and weigh all powder charges.
Eightbore, Could you elaborate on the "classic primer in the powder type of blowup"? I'm not familiar with this. I'm also inclined to agree with Miller that 5800 psi did not cause that type of deformation of the case head. Maybe a wad from the previous shot lodged in the bore, was blown out with the destructive shot and found downrange with the rest. I don't routinely look thru the bores of my guns before reloading even though that is inherently easy with a double (except for a Darne). Maybe this Baker is a reason to try to develop a habit of looking before loading.
