Which clause is it again that authorizes the Fed Gov to enter into a taxing agreement with an organization to provide hunting land? Surely, someone as quick as yourself should be able to find it fast.
And there is no such thing as unconstitutional Federal ownership of lands...
If you're of the persuasion that argues that something the Fed Gov is doing is constitutional because the Fed Gov courts said so, then you are on the way, way wrong website for your philosophy.