Cost of factory ammo aside...I think you picked a great cal. for a "one gun to do it all". A friend of mine just got a WinMag lately. As to the ammo reloading it the only way to go. My buddy is looking at three weights to develope loads with:
165
180/190
200

This will probably be reduced to the two (165 and either 180/190 or 200gr) in the end, depending the one that groups best. As to a powder recomendations...go with what you can find. We had a devil of a time getting a powder (Jan-March time frame).