try to find something in that caliber (.338) with someting close to the same case capacity and start from there. This thing should push a big bullet not very fast but it would be a neat little close range round.
There is a good article on the .338-08 in the 17th ed of Handloading Digest. Goal was 2500 fps with the 210 gr Nosler part and was easily achieved IIRC.