Goodnes, NO, Chops, not a fight. I'm exchanging information and ideas.
M-21 ring bulges, hmmm, Mike, you are the second guy in a month who has a ring bulged M-21. Now, would the obstruction that caused these bulges have caused a "lesser" gun to burst? Also, the proof load test, as I recall the details, failed action working parts, not the barrels. BTW, the bulge area is work hardened and to sustain further damage would require a bigger obstruction than the first in exactly the same place.
For anyone wishing to perform a little work hardening experiment, get a common wire coat hanger and a couple of wire pliers. First, bend one place about 90 degrees by hand and count the number of times required to break the wire. Repeat with pliers forcing the wire to bend in the exact same location (it is difficult to keep the bend in the same place by hand).
On the other hand, I also love my M-21 skeet gun.
DDA