if its just the crown then a few inchs might do the trick
there are little gauges that will tell if the bore is worn if you get a local gunsmith to have a quick look
I had my brno counterbored to maintain the front sight back before I came around to short barrels as there was wear at the muzzle end
it improved the accuraccy
trademe is a good place to find second hand barrels
try get a brand new take off barrel if you can then its at least brand new and they go for basically the same price as a used one
people are still taking them off all the time to build custom guns
I believe rem700 barrels have the same thread but a slightly thicker profile but im no rem expert so best to confirm that
you would need to sand the barrel channel out a little and re-varnish it is all
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