I am trying to decide on a new rifle caliber. Its between the 45/70, 30-06, 300 win mag. I will be moving to Idaho soon and want a gun that will be good for deer, elk, and bear. I am thinking maybe a 45/70 because of the thick brush in the area that I will be at and it may be the gun for between 50-100 yards.. But I am also thinking 30-06 because ammo is available everywhere and WTSHTF I want to be able to find ammo or barter for it. I am also going to be living in an area where there is Grizzly Bears, so protection if I don't have spray, the 300 win mag might be the one....suggestions would be appreciated.