Download the manual from Mathews site and the check the numbers on your cam just to make sure you have the right cam. As far as changing string and cables, again check the manual because some bows use the same string and cable lengths for a variety of draw lengths. And I`ll add that I don`t think that if I drew a NM elk tag I`d take a 50lb bow, go for more draw weight, better to have to much bow than not enough.