I just picked up in a trade a Rem. 700 action 27 3/4 inch #5 Douglas CM barreled 264 Win mag that has been shot less than 30 times. I don't know what the twist of the barrel is because I have not had time to measure it yet but assume it is a 9. What has been your experience for best powder bullet combos. I will be deer hunting with this rifle. I am thinking about using the 120 Nosler ballistic tips. I know the older powders, 4350's and 4831's have been the old standards but what about some of the new slow burners? Anybody using the new stuff?