Quote Originally Posted by Againstthegrains View Post
I just read somewhere that the newer guns have a Fleur de Lys stamped for Superior Steel Shot to indicate that the barrel is made from superior steel and protects them and allows them to be used with high velocity steel shot. I also know that my young nephew inherited his grandfathers O/U and the barrels started to bulge below the chokes (I think from using steel shot). Replacement barrels were more expensive then a new Baretta silver pigeon.
A-Rs post re steel shot definitely applies here, but I would hazard a guess that your nephew may have been using longer shells than the chambers were cut for...