Why re-barrel when they are cheaper to just buy another with a good bore?
Want a Mosin with a high quality "new", "unissued", "target" beefy barrel? It's called a Finn M39! They already did all of the hard stuff plus added a superb set of iron sights. Stock isn't the least bit shabby as well! Late model '67-'73 were built and hand tuned as "sniper/target training rifles".
I was so impressed with the 1970, which for all purposes appeared to be 'like new', I just had to order another and got a '67.
Other than the trigger, which was not 'hand tuned to perfection' like the '70, it too was hardly if at all used.
Wanting something to tinker with that eats 7.62x54R, that will stand up to a constant heavy diet of same on the range, there are few choices in decent bolts out there, other than that Czech rifle nobody imports.
The M39 will accept a hex mount PE scope mount
http://accumounts.com/ repro w/ six screws, which is about as solid a mounting as you can get.
Since it is a Mosin receiver, it will fit rather nicely in a Boyd's walnut stock.
Unfortunately, a nice custom wood stock is hard to find right now and even the Boyd's monte carlo is in scarce supply but
http://www.dmfirearms.com/index.php...ucts_id=1072&zenid=bq2q3a29io74u5bujg6oitr021
has a couple left. I just got the new one from them.
I used one for the M44 project and am quite in love with it.
Being solid walnut, you can drill the butt for
http://www.precisionreloading.com/recoilsuppressors.htm
a mercury filled recoil suppression tube that has proven quite effective and a LimbSaver butt pad (grind to fit) that all but eliminates recoil.
Sand and shape it anyway you want (but do include a Devcon pillar post epoxy bedding job and free float the barrel)
http://forums.gunboards.com/showthread.php?p=282054&posted=1#post282054
I already added a
http://www.huberconcepts.com/Mosin-Nagant_Trigger_Replacement.htm
With some fine tuning and polishing, the trigger is about as fine and smooth as you can get and fully adjustable. Already have it set as a precise sniper trigger.
There is even enough barrel ahead of the front sight to thread for a quality screw on muzzle brake. Still looking for the one I want but it will probably end up with one eventually.
While the eventual cost of the total package is going to mount up, there is still nothing else out there that will compare for the total price that lets you start off with as solid a foundation as the M39.
If you want to dick around with a custom that shoots 7.62X54R, I think the M39 is the way to go!
I expect to be fully satisfied with the eventual outcome of this one as it gets better by the day with each step in the process.