So the factory model 12 VLP has a 26" heavy fluted barrel. Mine was from before when Savage started sandblasting the crap out of everything, so it had a really nice finish on it. I pulled it off and sold it promptly for $180. Current barrels will be worth less. But not worthless...
Then I went to NSS (Northland shooting supplies - no links, use google) and asked regarding 1:8 twist barrels. Jim at NSS happened to have a 26" small shank Varmint contour (about 0.75" at muzzle) with a 1:8 twist and a 243AI chamber in stock. I took it since I had already been waiting some ungodly time for a 6.5mm barrel which eventually I never got. That was $330. Now NSS has CBI (Criterion) and Shilen barrels, and I only ever got 1 6.5mm barrel from CBI because no 6.5 barrels were forthcoming from Shilen in an entire year. It was a problem with a particular lot of bar stock, which I believe has been resolved.
I have several Shilen barrels and I have had negative feedback from members on the forum on them, but all of my Shilen barrels have been reliable 0.5MOA barrels. So far the CBI barrel is 1MOA at best and it is a 6.5x284 so it may only have 1200-1400 rounds in it total, so one cannot spend forever on load development. All I will say is that the CBI barrel which I got after waiting a year for a Shilen which I did not get, is not working out the best for me.
Jim is a great guy to deal with, you just have to actually call him on the phone. His attention to answering emails is old school... Get a new barrel nut and a 1x expense to get the receiver wrench and special wrench for the barrel nut. Even if you have a smooth nut, get the wrench since you will want to use it on the new nut. Then $30 for a go gauge from Manson reamers (one word on google).
If you don't need extra speed and can get a regular chambering, it does save a lot of work compared to the ackley chamber. It is also easier to get dies. But availability was a key thing for me, since I was out hunting coyotes 2 days a weekend.