Mike, the browning looks great, as does the hammer repair. Instead of a re-case, how about just backing the color of the new cc on the hammers back with steel wool til they they match the rest of the gun. You can also darken them a bit if necessary with cautious use of cold blue. The 30% or so original cc you have looks very fine! The 450/400 2-3/8 is one of my favorite cartriges mostly as the rifles made for it are usualy so light and handy.
All the best, Mal