I would try and talk it over with them.... Hard subject to bring up - you say they are friends, so I'm also guessing you would liketo not be a total jerk about it? Butlending a handis the least they can do - time theystart pulling their weight.
Do you ride up together - to your hunting spot? If so, thatcould be a nice time to have a "heart to heart" discussion with them about it. With all the work that needs to be done, say that you and the other owner have agreed that you needsome help from the people that hunt the land..... No help, no hunting..... In a kinda nice way you can tell them they better save some weekends to help out, if they want to hunt next year