Swamping is part of building a double barrel shotgun. If the bores are straight, and the muzzles are together, thing don't work right. It is just a fact of gun building. Many high grade American guns are swamped to the point where, if the barrels are cut as much as 4", the muzzles are still together, like my wife's DHE Parker #207,672, which is cut 4" from 30" to 26" and still has muzzles together. A.H.Fox provided 26" open bored guns for it's customers by cutting already completed barrels. This is mentioned on factory order cards. I believe Hunter Arms did the same thing. Some barrels from these companies did not have "together" tubes at the muzzle in original barrel lengths, even in barrels that are not particularly short.
