The 338RCM cannot ever live up to the MIGHTY 338 WINCHESTER MAGNUM.
Treat the RCM as a short case/high pressured 338-06, that's where it's at. Not bad, just not great, IMO.
That would only be the case if you actually
liked a .338 Win. I do not, nor do I like any other belted magnum. I think the Ruger long and short cases are the perfect answer, as they are slightly bigger around than an H&H case, but fit nicely in the actions. I have a .375 Ruger and a .338 RCM, and like both of them very much. If I were headed to Africa any time soon, I would have a .404 Ruger built, as has been demonstrated and discussed by a personal hero here
), and it would do very well.
Since the .338 RCM has slightly greater capacity than a .338-06, I doubt very much that it builds higher pressure to achieve the same velocity. And that's the true role of the RCM, whether Hornady wants to face it or not.
Dennis