I was reloading AA-HS hulls on a PW 375.I noticed the shot was too near the top of hull as I moved it to pre crimp station.I dumped shot and tried to reseat the wad.It wouldn't move.I had to cut top of hull off to get it out of resize die. When I pulled wad out and dumped powder,which I weighed and then looked in hull.I could see about a 1/4" between the top of the primer and the base wad.This was a Ceddite primer which are .001-.002 larger in diam. than win. I can only guess that the way PW seats primers and the primer being a little larger might have pushed the base wad forward.I can't remember if this is the newer HS or the first ones. The second picture shows a lighter powder burn mark about a 1/4" lower on inside of hull and than darker one starting above that. It appears as though it was reloaded & fired with the base wad foreward once before. Possibly the wad collasped enough to not be noticed. I hope I can figure out how to load pictures. Thanks,Dave