Chief,A key safety issue when sleeving any Damascus/twist barrels is the type of lumps used in constructing the origional barrels[ie; chopper,through,shoe or dovetail lumps] coupled with the quality and condition of the origional brazed joints.I recall one apparently quality gun that I had in mind to be sleeved. The detached barrels were clamped in a vice holding on the under lugs.A couple of moderate blows on the breech end of the barrel exterior with a lead hammer resulted in a visual failure/cracks of the origional brazed joints. Net result, a scrap gun! Perhaps more sophisticated tests such as X-ray or die penetrant of the barrel breech end would have shown the flaws in the barrel construction.
Take care not to spend money on sleeving unless the integrity of your barrel construction is first proven.
