Cory, you are correct in your thought as far as the barrel goes, but your understanding of the Accu-Stock is just a bit skewed.
When a rifle action sits in a stock, there are usually two anchor points ( action screws ) that secure the two together.
Because a bullet, and the resulting explosion from setting off the round, creates harmonics in the barrel, if the barrel comes into contact with something like the forend of the stock, it can create negative aspects on accuracy.
What the Accustock is doing, is providing a rigid base for the action to be attached to and it will keep it snug in the stock. This rigid base contact goes to a couple of inches in front of the recoil lug. This is pretty much the same as a glass bedding process.
The rigid base is not contacting the barrel from where around the recoil lug ( where the internal chamber for the round is drilled out ) forward, so the harmonics are left undisturbed.
Essentially you are getting a generic fit to the action from Savage that will make it better than just slapping an action in a fiberglass stock and calling it a day.
Does that help?