Adjustable Power Scope
It can never be said enough, if you have heard it time and time again or if it is the first time you have ever heard this. If you have an adjustable powered scope, keep your scope to its lowest setting while walking/hunting. If a long shot offers itself you will most likely have time to adjust the scope. I am not an expert by any means but, I have already seen numerous times including my own errors when I have had the scope set at a high power from practice and forgot to set it back and when a close quick shot presented itself, I couldn't find the animal looking through the scope. Keeping it set at lower power without a doubt would have ended with a harvested animal.