Re: .308 win, which bullet?
Don't rule out the Lapua D-46 185 gr FMJBT.
To be honest, if you're shooting F-class with that long barrel with the right slow powder, I would give 185-190's a close look, especially if you plan to shoot 1K yards. But, you may find better results at 300-600 with the lighter bullets.
In other words, the 155's may be your 300 yard winner, the 175 might be the go-to round for 600, and the 185 or 190 could take the x-ring at 1K. Many champion shooters have used lighter bullets where high velocity trumps wind at shorter ranges, then heavier bullets to buck the wind at longer ranges.
Here are the "measured" ballistic coefficients for your listed inventory:
Bullet G1 BC
Scenar 155 0.462
Sierra 155 palma (2155) 0.417
Sierra 155 palma (2156) 0.449
175 smk 0.475
178 amax 0.469
185 scenar 0.483
185 vld hybrid 0.569
190 smk 0.523
208 amax 0.683
G1 BC's from "Applied Ballistics For Long Range Shooting, 2nd Ed." by Brian Litz. A VERY RECOMMENDED book.
You might try the 155 Scenar vs. 175 smk at 300 yd, the 175 smk vs. 185 scenar at 600 yd, and maybe the 190 smk vs. 185 vld hybrid at 1000 yd.
Other thoughts... if you have to seat to magazine length with a standard chamber, you may want to avoid the VLD's. The 208 Amax normally requires at least a 30-06 to drive it fast enough. Consider coating your bullets with moly or Hexagonal Boron Nitride to get higher velocities and reduce bore fouling.
Everything depends on you and your rifle. Just experiment with it and have fun. But, I very much recommend Litz's book.
Good luck.