Just a quick question about the ARC feature on this rangefinder. When in the rifle "ARC" you have the option of selecting your caliber and it tells you the difference in holdover (in inches) you should adjust for. Now there is also another feature that is called re6 or something that i am guessing will give you true ballistics range. Anyone have any experience with this because the instructions are very vague? Using the "re6" mode would it be equivalent to using a rangefinder and cosine indicator?