Can you rechamber a .270 WSM to 6.8 by shortening the shank/chamber end and running a finish reamer?

The title is the question... wondering if a .270 WSM can readily be re-chambered to 6.8 Western by pulling the barrel, shortening the breech end by a thread or two and running a 6.8 finishing reamer to re-establish the shoulder. Seems possible.
There is no short answer.

More questions need to be asked.

What rifle?
Original barrel?
Barrel profile?
Is the barrel in such good shape that it is worth the expense?

I like the word "false economy". It means, are you going to spend more or have a huge hassle by trying to save the barrel. I did this with one of my first rifles before understanding that the life of the barrel past the throat is also a factor.

and

On a technical basis, sure. It is the practical considerations that will get you what you want in the long run.
 
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