Only rarely have I encountered a factory barrel that would not respond to good load development. What's good, what's not is often a matter of opinion/speculation. If you're looking for BR performance, you'll almost certainly end up springing for a precision aftermarket barrel. If you need a rifle that will harvest that critter, or score decently on an NRA Highpower target, then a factory barrel with Matched handloads will very likely serve your purpose. Some may even be capable of more accuracy than their shooter can manage.
Trigger adjustment, stock bedding, crown refreshment, proper ergonomic fit, and good optical parallax compensation are other factors that may deliver more accuracy improvement than a rebarrel.
Greg