The ideal action for you is strongly determined by your cartridge choice: the 7X57 can go in an intermediate length Mauser, but the .300 H&H really wants a magnum length action.

Here is my Western Field M720B built by EF Heym on an intermediate length commercial Mauser action for US import. This one has the traditional bottom metal with the small lever. I have been thinking of converting this one to .257 R (it is an '06 now).
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There are lots of good candidates out there...jim

LCDR Jim Dodd, USN (Ret.)
"If you're too busy to hunt, you're too busy."