I'd go with 308. You could always load it down to 300 ballistics. Or stoke it u to 308 performance and consider it a 300 Savage +P. My point is that for a new build the 308 gives you more flexibility. However, benig the fan of the 99 and 300 I am, I personally dismiss that action in 308 becuase they usuall go for a premium, the 300 is a solid performer, and because I don't think the 99 action is really all that well suited to the 308.
