I have been playing about with ladder testing and have a number of questions. 1. What distance is the most popular distance to shoot a ladder test? 200yds, 300 yds, 500 yrds, 1000 yds? 2. Single shots of a particular powder charge or multiple? 3. Charge increment? 4. With a new, unfired rifle how many shots would you run through it prior to doing a ladder test?