I'm bummed. The common load I run, and the one's that I was running when this occured was 64.5 grains of RL22 and a 139 gr Hornady with necked Win brass, OAL at .010" off the lands, same load I have been shooting for ever in all my 7 mags. without incident. My brass has always looked 100% normal without any incipient head separations or gas leaks any where. I'm extremely anal about my brass inspection process and never use brass that is in question of being worthy to reload. Anyone else ever seen something like this happen without any probable cause on the 700 SPS 7 mag.?