I think I already mentioned this, but for hand loads.
Your new rifle will tell you what shoots best in its barrel.
168 gr GMM SMKs should perfrom great at 600 yards.
If you really want to reach out further than that, the 175 gr GMM SMKs should perform better ballistically, as long as your barrel likes the heavier weight.
Factory ammo muzzle velocities are high enough to keep the 175 grain bullets supersonic out to 1,000 yards.
The 175 Scenar ammo should also have the same ballistic advantage.
The 155 grain bullets are a bit light to maintain their velocity out that far but they also might shoot really well in your rifle.
I have two .308 Savages - one likes 155 grain bullets better than 175 grain bullets but shoots 168 grain bullets almost as well as the 155s.
The other shoots 175 and 195 grain bullets best. Same length 24 inch barrels. Your barrels will tell you the answer.
As for brass, I use Lapua brass for all my most accurate bolt action rifles.
My experience shows that Lapua brass will last a lot longer than Federal brass (up to 3 times the number of reloads if you are not loading near Pmax) - but it is more expensive to buy.
However, even with the added purchase price, Lapua brass is still cheaper overall when you factor in the additional reloads.
I'm not sure that you would see any difference in the accuracy using either brass in the first few reloads, assuming you learn how to reload for precision shooting.
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