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The 6.5 x 47 lapua was being wildcatted before brass was available.

Now that shooters are actually taking delivery of those shiney new cases there's no limit.
As to comparisons, that was done years ago with all the mid-sized wildcats using the various brass available at the time. The only difference now is that making cases will be a lot easier.
While on the subject, I hope everyone will settle on a moniker for all the new 6mm/6.5x47 wildcats. It sure will make discussing them a lot easier.
Ray