Rule of thumb is 10% the cost of the hunt. You can adjust as you see fit for outfitter performance. I consider a decent opportunity as being a good job on the part of the guide, not necessarily a dead animal. He can' t shoot it for you. If the guide is bustin his butt to get you on elk and the weather etc just ain' t cooperating, I take that into account to when deciding on tip. I tip the camp cook $50- $75, same with any wranglers that are involved with my hunt.