I believe that a 14ga shell would not fall into a 12ga chamber in such as manner as to allow a 12ga to go in behind it. As a matter of fact it is a quite rare occasion of oversize chamber & undersized rim that will allow a 16ga to do so. The main danger from this account is the 12/20 combo.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra