My suggestion is to determine ahead of time, the max you are willing/able to give. Maybe that's in the 10-15% range. Then, towards the end of the hunt, based on the guide's performance, you determine how much of your "max" you're willing to give them.
Also, you may want to find out how many people will be "working" for you.
Obviously there will be the guide, but will there also be cooks, wranglers, etc. in camp? If so, ask the outfitter his/her suggestion as to how much they should be tipped.
A forum community dedicated to bow and crossbow owners and archery enthusiasts. Come join the discussion about optics, hunting, performance, troubleshooting, styles, reviews, accessories, classifieds, and more!