The 45ACP barrel: I'm sure I'll shoot it some, and then get rid of it. I don't see any use for it past the 'wonder what it'll shoot like' stage and then I'll sell the barrel to you or whoever wants it. Should take VERY little smithing IF any to fit another Ruger 77. The dozen or so 77s I've owned all spec'd pretty close to each other as far as bolt face to action face, thread specs, etc. I fit several Winchester [new model] 70 barrels to Ruger 77s with minor lathe work on the barrel face and shoulder. Ruger 77s are a great rilfe to learn barrel fitting with, much easier than a Rem 700/7 action IMO. [and I've fit a few of those, too].
I've always wanted a match grade heavy barrel in .358 Win, too. That's actually why I purchased the Varmint/Target stock you see in these pictures. It's on the 'maybe yet' bucket list.
So the barrel will probably get put of for sale after at least one more range trip, but I've still got a great Shilen barrel 24" sporter in .250 Savage Ackley Improved for this action and hence will need to keep the action, origional walnut sporter stock......this laminate target/varmint stock I'm not sure about yet.