Leave it as-is. You have no guarantee a new barrel will shoot better. You may end up spending $600 to make the rifle shoot worse.
is this really a risk, that it gets worse? This isnt a comparison but I put a KIDD barrel on my 10-22 and it has become a target rifle
But probably going from an already good centerfire barrel to another may be a different beast....
I already see that this whole thing is not easy and not cheap ...
The smart thing would be to reload and probably get just the same improvement, its just that reloading precision rifle rounds is such a pain in the ass
I am thinking the money may be better spent on a new scope.... I have a Bushnell tactial and it was ok 10 years ago but now compared to a Vortex Gen2, its a bit meh and dark ...