craigd,
The riveling issue can be traced back to the time when the double M.L. was the standard hunting weapon.It was found that continued firing of the same barrel in a double gun resulted in the losening of the charge in the other barrel.Unless the charge in this unused barrel was tamped down prior to firing riveling could occur!This was attributed to wave pressure caused by staggered ignition of the charge causing pressure peaks well away from the breech.
Over the years various experts have attributed riveling to wave pressure .This it was said,likely resulted from fragments of cleaning material or a wad left in a barrel; or as others have suggested excessive oil in a barrel, in particular if a gun has been in storage for an extended period of time such that the oil has hardened up.
Barrels with wall thickness below minimum recommended thickness would obviously suffer from more severe damage under the above circumstances.
Last edited by Roy Hebbes; 01/19/12 06:39 AM.
