You could pay someone to do the conversion that entails altering the bolt face and feed rails mag box, etc. and hope that it feeds and functions ok when all is done. After paying the cost, you would end up with a long action rifle chambered for a short action cartridge and about 100 fps better velocity at the same chamber pressures.
For the same or less money, you could buy a new rifle already chambered for the 300 WSM
round if you want to run one.