I'm not sure there is a "THE" bullet for anything, but here goes...

I've said it before and I'll say it again, I'm a pretty simple guy and I hesitate to change anything that's already working. Therefore, my preference is still the plain old 175gr SMK. It's not fancy and it isn't what the cool kids are doing, but it works.

That said, 155gr Scenars are good too.

That's the only two bullets that I've seen perform well in a lot of rifles at both 600 and 1,000. I'm definitely not saying there aren't better bullets for certain rifles, but the 155gr Scenar and 175gr SMK seem to shoot well out of just about any good 308.