If I go out and grab a CZ550, what's the most powerful round I can have it rechambered in?
.577 NE? .700 NE? .585 Nyati??

Thanks in advance...

Of the 3 you listed, the 585 Nyati, the other 2 are rimmed cases and the bolt face would not be able to be opened up to accomadate them.

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AlleninAlaska

Ooh! The Nyati. Cool. Time to track one down...

Glock,
You could squeeze in the 3" version of the Nyati, slightly more powerful.
And if you wanted to rebate rims you might even get the 577 T.Rex into one.

Karl.