The 175 SMK does fine out to 1k. Now if you want to get creative get the new Sierra 175 TMK bullet. They have a listed BC of .545 and that's at only 2400 fps!!! Also you have to remember what fps you can push certain bullets give you certain BC numbers. So to just read the first BC number I would say is not really accurate. Let's take the 175 SMK. At fps over 1800 and up to 2800 you get .496 BC. Now over 2800 is where you get the .505 BC.
Now the Berger 185 is listed at .560 but what speeds is that listed for??? Berger does not state this info. So I'm willing to bet that you might not get that top end BC with the 185 being that's a pretty heavy bullet for a cartridge that allows only so much powder. (.308 Win) Its why I tell people that for a .308 Win case I would say up to the 178 amax is the heaviest I would shoot personally for long range. Now for short to medium range what ever floats your boat being you will be push most bullets fast enough.
But anyways check out the 175 TMK. I personally just bought a box of 500 and can't wait to try them out.