I don't reload 308 but I do load the 175gn bullet for my K11 for ETR range use. They are okay ish on Fig 11 out to 1k if I can get some one to spot!
For target shooting I much prefer the 155gn scenars. I use N150 for both.
Getting back to the op and his 30 inch 308 I would opt for N150 too if I was loading for it.
And I would be looking at using lapuas - the 170gn lockbase or the 167 scenars.
I have a couple of friends using the 170gn lockbase in 308 @ 1k and do very well with them.
They were designed for long range and one of Vihts accuracy loads is this bullet and N140 in a 24 inch barrel.
I wouldn't be in a rush to be using ppu for any thing other than causal shooting.
At least you can get the lapuas at a decent price in 1k boxes.