I have a Sinclair concentricity gauge and want to make sure I'm measuring things correctly. 1. For bullet runout, where on the bullet to you measure? I've read that you want to measure on the Ogive, but the Ogive isn't one single point but a curved section - right? I imagine the main point is consistency between measurements, but would like to know if there is a conventional location on the bullet I should use for reference on answer 2 below. 2. What is a reasonably good bullet runout number when a reloading process is working well? 3. For case neck concentricity/runout, where on the neck do you measure? Out at the edge? Middle? 4. What is a reasonably good neck runout number that would signify a good usable case? I know I've probably over simplified things, so appreciate any thoughts and advice. I'm trying to tighten up groups on a LRH rig and not shooting bench rest...I know the answers to 2 & 4 above might be different if I were talking BR.