KDGJ, You did a fine job of using my charts as they are intended. First, we need keep in mind that the charts give a sorta starting place value. Value is a recommendation. Price is an amount of money that a willing and able buyer agrees to give an equally able and willing seller. Many factors may influence price that are unknowable to the value charts.
Michael, we need to know the CC of the rest of the gun. Guns that would have higher value except for the barrels are much better candidates for sleeving than are low value guns.
Sleeving is for barrels that are non-repairable. This condition may be from wear or from an accident. A high condition gun is unlikely to have worn barrels. So, a high condition gun with sleeved barrels is most likely to have met with an accident. Properly sleeved, such a gun returns to being a reliable long term shooter. On the other hand, a low condition gun likely has worn barrels and has had alotta lead down the pipes. That means there are likely a number of breakages on the horizon. Sleeving a worn out Boss does not get you highly servicable gun. The only way to approach a worn gun is to make sure it is purchased at a price that allows all wear, including those worn barrels, to be set right.
Dig Hadoke opined in his first book that a best work gun with worn out barrels and stock can be had for little enough money to allow new barrels (not sleeved), a new stock, and all action functions set right for something like $20,000. His point is that you then have near new best work gun with barrels and stock to your fit for a somewhat affordable price. I'm going to start a new thread to discuss a case on this point.
DDA