Re: first time .308 loading
Fed GMM brass isnt bad brass but my opinion is that the Lapua brass is much more concistent not only from case to case but lot to lot. Also with the GMM you will need to debur the flash holes where as you do not need to with the Lapua. I have found the Lapua brass to last longer as well.
I like the Fed 210 GMM primers myself.
RL-15 has been my 308 goto powder. Varget was good but RL-15 was cream. Lately I have been using BENCHMARK with smashing resulst. Little less velocity, stellar accuracy.
If I were in your shoes, I would try VARGET, RL-15 and BENCHMARK in that order.
If none of those made you happy, then try H4895 and IMR 4064.
You will have a hard time beating ANY of the 155's. AMAX, SCENAR or PALMA or VLD's. The 175 SMK or VLD and dont overlook the 178 AMAX or 190 SMK either. All of the above are awesome 100-1000 yard performers.
For hunting look to the 150-180 ACCUBONDS.
Good luck and let us know how she shoots!
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.