Find someone with a bench vise that lives close by. Get the idea for some wooden barrel blocks on this forum that will fit your vise. Buy a barrel nut wrench, buy a 308 or other barrel from gun shack. Get a 308 and 30-06 go gauge. Have a local smith break the nut loose for you. Interchange barrels.
If you are recoil sensitive you might consider trading someone out for a lesser caliber. All of the 308 based or 30-06 based cartridges will fit your gun with no modifications.

If you get it from midway you get the wrench and the g/ng gauges.
http://www.midwayusa.com/product/637...tainless-steel