RMEF holds TV hunts with companies/groups/people that support its conservation mission. It also conducts hunts with RMEF members, volunteers and other common folks--and yes, some of them are on public land.
It does not own any ranch land unless it's in the process of conveying that land to a state or federal agency to manage. It is against RMEF bylaws for RMEF staff or board members to hunt on any such land.