Re: 308 barrel replacement options
For 308's I am very partial to the 26" sendero contour barrels fluted. They are a good balance between weight, ridgidity, speed and consistency. Any of the top manufacturers will work well. Lilja is great but so is Hart and many others. I like the Hart because they shoot as well as anything else I have used and they deliver very quickly. If you know for sure that the 180 is the max bullet weight you will use, the 12 twist will work very well. Even up to the 190's. The standard is that 12x barrels will handle the 200 grain variety but I feel that 11x is a bit better for the 200-210's. You may concider the 11x. Many guys right now are having good success with the 208 AMAX in the 308. The 26" 11x will complment those loads very nicely. The 11x is also very suitable for 168 - 190's. I have had good success with the 11x and the 150-155's but have had MUCH better success with the 150-155 using 12x.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.