Just posting what I recently learned and for the experts here, feel free to chime in and correct me. I was trying to understand why my OALs were different per bullet I was seating. I asked the question and people replied with issues surrounding problems with the dies/equipment/brand, etc. I did not specify I was measuring from base to bullet tip nor did anyone ask. I had been wanting to buy a Hornady OAL gauge, so I started reading about how it works and I learned that measuring from base of the case to bullet tip can give variations up to .025, so the most consistent measurement is from the ogive. I had no idea. So i learned not only do I need the OAL gauge but also the the bullet comparator to measure from the ogive. Now I'll really know where the ogive is from the lands as I load. This was all news to me and though maybe sharing my experience might help someone. I guess I just assumed that high quality and match grade bullets were all consistent but they are not past the ogive.