I do not believe this was a 20 in 12 burst, its too far forward. The rim of a 20 gauge shell wil lodge in the forcing cone of the 12 & will usually result in the barrel giving way at the juncture of the chamber & cone. The ring bulge on this one is out right at the forend lug.


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