I'm familiar with the "rounded" look of that era's rifling technology, but the problem (in answer to your question) is the pitting... just forward of the breech... here and there in the bore and just at the end of the muzzle.

it may shoot just fine, but i know myself well enough to know that this is a gun i would want bring back to near-perfect, so i'd want it sleeved.

Great find on your WR, by the way.

Question is, who sleeves them? and presumably it would have to be re-regulated?

When you say "Sleeve" do you mean cut off at the barrel block and mono-block in a new set of barrels, i.e.: traditional shotgun "sleeving?"

Or do you mean that the bore is drilled out (with the barrels left in-tact) and a new rifled chamber and bore soldered into the newly drilled hole?

Finally how much is "Expensive?"