I've always been taught that lighter bullet accuracy suffers a bit if you spin a bullet faster than necessary to stabilize it in flight.
That's true, but only valid if you and your equipment can shoot the difference.
A factory 700 heavy barreled 308 of mine with a 12 twist stabilized a 190 Match King just fine, so unless you were wanting to go to the real 30 cal heavyweights, a ten should be fine.
