I would stick to the 300 win mag. For all practical purposes it is the equal of the 300 wby mag and has a much broader range or available ammo and guns. I would stay away from the weatherby guns also. I have heard too many people complaining about them lately. All of the belted magnums are going to be over kill for whitetails but dead is dead so thats not really a concern. THe 300 win mag is available most everywhere and is a very versitile round. I think it would serve you well.