Could someone please make this simple for me? I have read and read about head spacing and seeating depth and it has only confused me further. 1) How do you decide how far to seat a bullet? 2) What if anything does this have to do with head spacing? From what I gather, head spacing is the scace between the front of the case to the part of the chamber that stops forward movement. The reason I asked is because someone told me to back my headspacing off by .002-.003 for my AR to ensure easy loading etc. I thought this was determined by the chamber on the gun and the length of brass, not how far you seat your bullet. The stupid part is that last week, I really thought I knew what I was doing until I asked about this damned AR!