You will definitely want to have a range-finder on your sheep hunt. It is designed to give you with the distance to your quarry, but even more importantly, it will raise your confidence in making the shot and closing the deal.
Range-finder technology has really made incredible strides since I purchased my own, before my first sheep hunt. The distance out to which they are exact has increased, along with the development of features that can tell you the true ballistic distance to your quarry. When it is above or lower you on the mountain. One more feature that I really like is the red readout, in lieu of the black LCD readout that is found in nearly everyone units. Steps have also been made in making the units more compact.
How to select the best Rangefinder
Every range-finder must have one question in his mind that what is the best range-finder for hunting? The best one is a laser range-finder, which I personally used myself and the reason I chose it was the red readout, which at the time, was the only range-finder on the market with red readout. To me, it is far more readable under any light condition, and was valued the premium price I paid for it. Select whatever unit you feel will work best for you, but make sure you must bring along on your sheep hunt.
If I was slow to catch on to the importance of binoculars, there is one optical device I haven't hit the spring woods without for as long as they have been available: laser range-finder. I don't know how many hunters are above the attraction to push the range limits of their shotgun, but any hunter who has ever sat pinned down for an hour or more by a tom strutting just out of range, arm tiring from holding the gun in position, a tree knot digging into the back, a root making the butt numb, and a bug humming under the face net, can understand the temptation. Add to that honest error in judging distance, and there is little doubt that most turkey hunters could benefit greatly from the use of a good range-finder.
Even the most patient and cautious turkey hunter will find Rangefinders beneficial. By setting up and ranging on several prominent landmarks, the hunter can in effect form a shooting perimeter at the maximum effective range of his shotgun, beyond which he will not shoot, inside of which he will pull the trigger at the very first opportunity. This inspires confidence, and leaves the hunter free to concentrate on calling strategies and the bird itself, without the distraction of worrying about when to shoot. Ranging on an approaching turkey is not practical, and there will be occasions when the range-finder cannot be used at all; in most instances, though, ranging on a few landmarks immediately after setting up takes only a few seconds.