... that the shell was a handload, with an extremely excessive charge of possibly the wrong powder, with the shot very probably buffered with flour ....
I remember being told years and years ago when I was loading some highly reduced 30-06 loads and using a filler, that there were some materials that just weren't good filler choices. When compressed they begin to act like a solid, jam in the throat, and can disassemble a rifle in short order. Flour was at the top of that list. I used Cream of Wheat, Grits, or Kapoc and stayed away from the flour.
Only recipie I ever found for grits that was to my liking. 2000 fps grits. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
