Mont. Code Ann. § 27-1-721

A person who is designated as a hunter safety instructor or hunter education instructor by the department of fish, wildlife, and parks under 87-2-105 or certified as an instructor by a national firearms association, who trains people in the lawful use of firearms, and who is not employed by a governmental entity is not liable for the conduct, acts, or omissions of a student handling firearms unless the instructor exhibits gross negligence giving rise to causation of the damages.