Mine is very mild to shoot in 308 with a variety of factory ammo. Weighs 5.5lbs bare. The carbon fibre stock is very straight, which probably helps. I've had several 308s in various configurations and expecting to stay on target would have been wishful thinking with any of them. The Peak probably gives more chance than the others did.
What do mean by "composite", if not the CF of a Peak ? Something as heavy as a Finnlite stock (should be called a Finnheavy) or a B&C ?