Remingtons website and the Hornady website have ballistic calculators on their site. For the app search for "ballistic calculator" you will have several to choose from. You need the ballistic coefficient for your bullet for any calculator to give you good info. If you can't find the bc for your bullet use one of the same caliber, weight, and shape. It will be close enough to get you started. Then shoot and see if it is correct.
You can't fix stupid....however ignorance can be cured through education!