I have the hornady oal gauge and bullet comparator. From what I understand I am using the oal gauge to find the seating depth where the bullet meets the throat. Is that correct? Can someone explain the steps to do this? And how I then use the bullet comparator with my calipers. Is finding this seating depth only good if I am using a competition seater die? or will I be able to seat my bullets to that exact length with a regular seating die?