I did some testing today and came up with a max length of 2.505" after 10 averages of pushing a bullet in an empty case. To find my powder combo should I load to 2.50" and once I dial in a round, then play with backing off? Or perhaps start at 2.495? This is all very exciting, being a surveyor and son of an engineer, building and testing and keeping excel sheets is very fun to me. I might be kind of weird.