Rolly, since your going with the ruger m 77 action I personally would go with the 30/06 as the magazine is designed to accommodate the 63 mm case length.
I don't know if the rifle would have feed issues or not with the 57 mm case. If you like 7 mm better have you considered the 280 remington? As far as resale value I'm guessing the 30/06 may be the number one saleing hunting rifle caliber in the world but that is an uneducated guess. Whatever you decide have fun with your project and it is a pleasure to meet your acquaintance.
