the Federal brass is soft, and thick... I wouldn't use that for this load.
I like IMR 4895 in the .308, it's one of the better powders. In Lapua brass with a 175 grain bullet you'll find the OCW node at 42.2 grains--in all likelihood...
With the Varget in Lapua... work carefully to 44.7 grains. That'll give a little more velocity than the 4895 load, but may or may not be as accurate.
CCI primers work well with Varget, as do Federal 210's... I like Federal 210's or match primers with the 4895.
Good luck... let us know what you find.