I suppose you could always try a real estate agent. People who are trying to sell farm land, often mention the hunting value of their land in their real estate ad. Maybe a realtor can refer you to a client.
If you acquire a lease and the land is sold, the new buyer has to honor your lease. This can be a plus for you and a negative point for a buyer. Times are hard and somebody may be willing to lease to you, but if the land is valuable for hunting, it has probably been leased for years. Give them a try. You have nothing to loose. Tell them you are a prospective buyer. Sometimes land that has just been timbered and clear cut, is offered for sale. That would be your best option.