Austin, thanks for bringing up the most important reason for not fooling with forcing cones and chambers. If a plastic hull separates from the brass and goes into the barrel far enough to allow another shell to be inserted behind it, your gun will blow up. Not that it might blow up, it will blow up. The forcing cone in an old gun will safely restrict a plastic shell from going past the cone and you will not be able to insert a shell behind the obstruction. Such an error will usually not go to the point of gun damage in a double barrel shotgun, but in a pump or automatic with a relieved forcing cone, it would be very easy to make an expensive mistake.
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