Damon is 100% correct.
If all you want to do is spend between $300 - $500 for a new barrel then go for it, but realistically if you are already shooting good groups play with your loads some more. seating depth will tighten up horizontal and powder charge will help with vertical , but a new barrel may not help with either.
I personally have shot a lot more .5 groups than .1 groups with custom barrels and I shoot on average twice a week off BR set up from concrete benches that are dead level. I have factory barrels that shoot 0.225 - 0.228 every time out but that takes a lot of load work up, I also have some that no matter what 0.750 is as good as it gets on a good day.
With what you have if you were shooting club matches in Factory class you would clean house on most days. My advice shoot what you have until it won't shoot anymore.