Just finished an experiment to try and get by with what I have. Drilled out the center flat of my 115 GD plug about 3/16 deeper leaving the outer cup alone. Polished up with some emery and now the bullets center up solid with full contact around the ogive radius. Seated up a dozen rounds and the COL is consistent to the nearest 0.0005 precision on my Starrett. I think I'm about as good as I can get
