It is easy to fire form 30-06 case converting them to 318 W-R. Trim the 30-06 cases to 2.385, prime them, load 11 grains of Bulleyes pistol powder, fill remaining space with cream of wheat, and plug the case neck. I stick the case into a bar of soap and when you remove the case the soap will plug the neck holding the content in place until the round is fired.

Fire the loaded case out of your 318 and you will be left with cases fire formed to the chamber of your 318. It is a little messy but simple.