Mostly just for fun, I played with a way to measure COAL to the bullet ogive. I loaded a round then took an empty (fired and not resized) case and placed the bullet of the loaded round into the case mouth of the empty case (going into the empty case mouth backwards). I then measured the length of the whole thing together and subtract the length of the empty case. Seems like that would yield a measurement from the base of the round to the bullet ogive. Any reason this won't work?