Having said this why not just rebarrel it to something like a 25-06 considering that you are starting off with a long action to begin with. Ammo is widely available and recoil is still very mild.
That'd be the most efficient thing to do, I suppose, given that I already have another .25 cal rifle. But it'd almost be like having a closet full of nothing but white shirts and black slacks... it strikes me as being practical, but boring.
Mike