Re: resoldering old double barrels
Only a few shops in the country do (or did) that kind of work and the cost was prohibitive unless the gun was something extremely valuable. The shop I was working at sent a Parker to be resoldered and IIRC the bill was on the order of $1200. And that was some years ago.
Since most old doubles, percussion or cartridge, aren't worth a tenth of that, the suggestion by StoneChimney seems good.