Sherman Bell's articles in the Finding Out For Myself series proved this to be much closer to the chamber than most believed.
Note that Bell "Confirmed" this to be true. I do not know his age but no doubt this was "Proved" long before Sherman was born. It seems all the old gunmakers knew it as they befed up the "Breeches" of their shotguns. The old E I DuPont De Nemours Co published some graphs of pressures generated by 5 different powders which showed this well in the late 20's. These graphs have been posted here on this BBS on several occasions. burrard new it well when he was doing work on his "Modern Shotgun" prior to WWII.
