I have desired the very same thing, but it is not practical until I found the 50 B and M Alaskan Super Short. I just need the cash to do it in a Striker. It is a 300WSM cut down to 1.640" with a 50 Cal 300gr at 2400fps out of a 16" barrel. Brass would be easy to get and the 50 cal is kind of cool.

http://www.b-mriflesandcartridges.co...per-Short.html