I really liked "Black Powder Hunting" from The International Blackpowder Hunting Association. The last issue I recieved was early this year. I heard that they went out of business. Figures, I just had renewed for three years.
My second choice is CVA's Blackpowder Guns & Hunting Magazine. It features a lot of people using CVA's (since CVA puts it out) but there is still good information about other rifes and hunting with an inline muzzleloader in general.