This is a fundamental question, and the problem has the only answer, and the answer is that it only depends on your comfort ability. If you are a person who is OK with 50 yards’distance, then you might not feel the need to use the zero scope, but if you are the person who needs to use it even at 25 yards, then you will use it. On the other hand, if you are the person who is feeling to need if zero scopes at 100 yards, then you are right to.