@fchan, with your 1-10" twist you'll be able to shoot just about any .30 cal bullet. Choose whichever one works best for your needs. There really is no such thing as a bullet being "too light for a 10 twist" or "too heavy for a .308", though opinions on this vary
Hornady 168s (there are two variants) can be a bit "fussier" (more work/tuning) to find an accurate load for than Sierra 168s, if this matters to you.
Sierra 168s are "lower performance" (i.e. blunter, and draggy-er) than Hornady and many other 168s. Also, 168 Sierras can experience accuracy problems at distances farther than 600 yards (other 168 match bullets don't have this problem).
In its favour the 168 Sierra is one of the easiest match bullets to get a good accurate load for (load it to standard 2.80" magazine length, in any cartridge case even a somewhat crappy one, use any primer, use any mid to max load of powder, and you're quite likely to have some pretty darn accurate ammo).
@thump_rr, Sierra 180 MatchKings are good bullets. They are not at all a "heavy" bullet for a .308, they're more like "mid weight", and they are a perfectly good and sensible bullet to shoot. They are a "medium range" bullet (their boattail is not as slender as the Sierra 190 or 175). Because of this, they tend to be easier to get to shoot accurately, though the tradeoff is that they are slightly less sleek (they lose speed a bit faster). Out to 800 yards they are great, beyond that they'll still work of course but if you want good long range .308 ammo there are better choices (Sierra 175 or 190 MK, Berger 185 BT or Hybrid, new Sierra 155, Berger 155.5, etc...).
