I am looking at buying a 30" barrel threaded for a Large shank savage action and chambered in .300 RUM.

My question is, what should I look for in a Savage action to accomodate this barrel? Is there any std. action that will support this without a bunch of modification?

Long action or magnum Action length?
What size bolt face?
What about magazine size?
Other requirements?

Thanks for the help guys.