Re: .308 twist?
Check your specs on the ltr I believe the twist is 10x
If I am wrong and it is 12x the 150's to 180's will work much better but the 125's will work with the 12x fine.
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.