Number one rule of elk hunting is never ever shoot the lead cow. Had a partner shoot the lead cow on an antlerless hunt north of Bozeman once. Fish and Game aged her at 13 years. My partner wanted to give me some meat for helping pack her out but after cooking up the first package of steak I asked him not give me any more (it was that tough). The best eating elk I ever got was a bull calf (if he was a deer we'd call him a button buck); My, was he tender and tasty