Grayfox, I have observed the throat of some of my rifles with a bore scope and it looks like they do indeed wear unevenly. 
There is a possible temporary fix with fire lapping. At some point it effects accuracy enough that it warrants a new barrel or face it off and rechamber the old.
But if you can find the sweet spot for a long-ish bullet jump you can keep shooting the same barrel for a lot longer
There is a possible temporary fix with fire lapping. At some point it effects accuracy enough that it warrants a new barrel or face it off and rechamber the old.
But if you can find the sweet spot for a long-ish bullet jump you can keep shooting the same barrel for a lot longer