I'd recommend you visit Dan Lilja's site and watch his bore scope video if you haven't already.
check out the video comparison of a handlapped bbl, vs Remington take off bbl.
Allow that to assist you whether or not you should go with a new bbl. Personally, a new handlapped bbl., coupled with handloads is the only way to go, IMO.
If you are going to reload, my first recommendation is to get the manual that accompanies the bullet and powder you plan to use. Unless of course you plan on using a bullet like Wildcat, then you have to go at it with what you have.
If you plan on shooting Sierra MK bullets and H4831, then those are the 2 manuals you should be looking at when loading. Especially the bullet manual.
I have 3 270's and all have different bbl lengths and are used for different purposes. My Ruger wears a 25.5" Hart bbl and is a tack driver. It prints on average 1/2" groups with 130 TSX bullets and Re19 powder. But several groups are just about one holers.
I feel that a new bbl is such a step in the right direction. AND, you can rechamber the rifle to another long action if you wish. A 280 AI was mentioned and that would be an excellent choice, especially with a 150-160 grain bullet.