What is the minimum centerfire caliber rifle for hunting big game, such as elk and deer, in Idaho? How many bullets can I have in the magazine?

There is no minimum caliber for centerfire cartridges. But it is unlawful to hunt big game with rimfire ammunition. The number of bullets is limited only by the size of your magazine. For more information see Page 65 in the 2009 Big Game Seasons and Rules brochure.