My personal opinion is , if your going to buy a 70lb bow and shoot it at 60lbs , then your better off buying a 50-60lb bow and getting the maximum performance from it. For whitetail hunting (or any NA big game), there's nothing that a 70lb bow can do that a 60lb bow cant. The second most important factor in setting yourself up for hunting is arrow selection. The first and most important , is being comfortable with your draw weight.