In the .243 Win, my barrel maker suggested 1:9, though the Winchester standard is 1:10. I don't normally shoot 100 grain bullets, so it probably doesn't make much difference, but have shot Barnes TSX 85gr. and Hornady GMX 80s; it shoots them pretty well and they're fairly long bullets.
Regarding stabilization; bullet length is more critical than weight. That's why round-nosed bullet often shoot more accurately than pointed bullets of the same weight.
People are like rifles. Some are tried and true, having great eyes, personality, and fun to be with. Others never seem to hit the mark with you. Still others go off half-cocked. Still, it's nice to know most of them.