Highly recommend you get yourself a reloading manual. Having a mentor is great and they can answer questions and explain things to you in as many ways as needed to help you understand some of the concepts. But much like learning to drive, you can pick up your instructors bad habits too. The Lyman manual is excellent.
You can shoot an 18" 308 out as far as you are able to account for drop and wind drift. That could be anywhere from 400m to 1400m really, depending on your optics, bullet selection, and how well your hand loads work out.
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