In 40 years involvement with shooting, I know of only two instances of a burst/bulged barrel directly to someone I know;

The first was my Father, who got a bulged barrel due to an obstruction (snow). The gun was a low grade s/s, probably Belgian.
The second was due to (almost certainly) wad left by a misfire obstructing the barrel, causing a burst. The gun was a good Birmingham gun.

I have heard (anecdotally) of a few other instances, but never with much detail.

I have seen several examples exhibited at shows etc., notably the result of 20 bore cartridges in 12 bore barrels.

I have also seen a friends (by a good well known maker) modern o/u sheared through the action. Manufacturer replaced without question.

Last edited by JohnfromUK; 12/30/13 03:43 AM.