When a barrel is "shot out" the rifling is usually worn in more than just the throat area. Wear occurs all along the length of the barrel on all sides of the lands and in the groove itself. Not only is the throat eroded but the metal is fire-cracked. Just running a reamer into the existing chamber and attempting to clean it up often requires some serious metal removal.
It's a less involved process with a Savage than on a Remington but the breech end of the barrel may need to be turned back too if you have to go deep with the reamer in order to find "fresh metal". The process COULD be hard on the reamer as well as metal that has undergone the ravages of heat and cracking often does not machine as smoothly as metal that has been heat treated to relieve stress and any potential hard spots.
As for re-chambering a "fantastic performer" barrel, good chance the performance may go away. I'd bore scope it and if you have cracking and carbon buildup in the throat area do like my barrel maker suggests. A tight fitting patch on a jag with some Simichrome polish. Work the throat area and keep shooting until you just can't get it to shoot anymore then replace. You'll at least save the cost of a reamer.
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