You could not pick any better cartridge for your needs! Shilen barrels are superb. But there's nothing wrong with the Douglas Premium-grade barrels, either!!
BUT, if you are looking for the ultimate in the way of unusual and high performance, take a look at the
7mm Gibbs. It is just about as far as one can go with a maximized .30/'06 case! How does 3300 FPS with a 139-grain bullet from a fireformed '06 case sound??