I picked up a box of Black Hills some time ago for some testing in one of my bolt guns.
Yesterday, at the range, I ran 5 rounds of it through my FNAR 20" heavy barrel. The Black Hills did well when you consider a cold bore shot was included in that group of five. I realize that you do not want to hunt with 175 gr SMK ammo, but Black Hills has four .308 Win hunting loads on their web site
. Nothing in 175 gr but they do have 168 and 180 gr offerings. I'll bet they are using the same powder in all of them.
I've also shot 1" groups with Winchester 150 gr. Power Point (from Walmart). I was using it to foul the bore.