I think the question of thin barrels and their affect on accuracy of a light mountain rifle is complicated. They do heat more quickly. For hunting purposes, where one shot usually does the job and very rarely do we need more than three, that does not matter. It can, however, affect the accuracy of the hunter. You can hold more steadily from the usual field positons with a rifle that tends to be somewhat muzzle heavy. This allows the rifle to "hang" which reduces the amount of ground covered when you wobble. A rifle with a light barrel and center of gravity farther back is harder to hold on target unless you are shooting off a bench or from a steady field rest. Add a bipod and you can bring the balance farther forward and shoot well but you have also added weight. IMO, the best solution to the need for a light rifle which can be shot well from field positions is a short action with a barrel normal in weight and length and with weight reduced at the rear of the rifle rather than the front end. Numerous rifles meeting these requirements are available in 7-08, a good light rifle cartridge. Savage would be a great choice in the lower price range. The Tikka has a long action but a normal weight barrel and a lot of lightweight plastic in the action area. It balances well. Flatland hunters and stand hunters aren't so concerned about rifle weight. Young hunters in great shape can climb the mountain carrying any rifle.
