Whats involved in rechambering a milsurp rifle for BIG cartridges?

I have been following this thread with some interest. What about the .375 dakota and that case necked up.I would deliver the same powder capacity as a inproved H&H case and fit in a Mauser magazine. I am not sure what you would have to do to get the thing to fed properly or would you have to make a cutom wider magazine. Would it be a major hassle compared to the standard magnum?
 
Barry Jenson at Bits of Pieces has a reamer for the .375 Dakota. It is a good option, but brass is expensive and hard to get. Ditto for the dies.
 
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