The Sierra 155 Palma or Berger 155.5 Fullbore are both very good bullets, and will get to 1k easily, even in a 10 twist. Seen it done many times, and at considerably above 2850, despite what others might claim. Fliers started more in the >3100 range

followed shortly by bullets just not making it to the target

Shy of that, back down at reasonable velocities (2950-3050), they just don't care that much whether its a 10 twist or a 13 twist, or something in between.
The beauty of 155s in a .308 is that a drunken monkey could fall off a stump and accidentally find an accurate load on the way down. Someone who knows what they're doing, putting actual effort into load development with them can be terrifyingly accurate. Most of the serious .308 shooters I know agree that the 155s are *very* difficult to best when it comes to sheer accuracy, particularly vertical. They are very, very forgiving of all manner of gun-handling sins.
Windage... is a challenge. 600 and in, I'd say take the more accurate 155 load, and spend a little extra time getting good at reading the wind. The difference isn't that huge. At 1k... you're going to have to be really on top of your game to outperform shooters running heavies. Ironically, to me, the difference isn't in big wind conditions. It's not that hard to see and identify a big change, and twist the knobs accordingly. It's the light twitchy conditions that you *can't* see, or can't read well, where the heavies actually pay dividends... its the difference between a squeaker 10 and a 9 just over the line, that's what kills you.
The 185s are *almost* as easy to tune as the 155s... not quite, but close. And they do have a better B.C. Gun handling is still not *too* critical.
The 200s... for me at least... are way, way fussier to tune. The accuracy windows are much tighter. Minor variations in seating depth, powder charge, component lots, etc. can take a load from good to bad rather quickly. Gun handling becomes *very* critical. If you can do everything exactly the same, every time, great. But minor inconsistencies in shoulder and cheek pressure that would hardly affect 155s start slinging bullets up, down, all around with 200s.
It makes the scores shot with 200s in recent years that much more impressive, at least to me.