Bill used measuring tools for the barrel such that diameters are to 1/1000 in. The number of loads tested was about 100 per type.As to sampling statistics I did not (even though I taught a class on sampling and the math that is used).The glitch was that the original Pressure Trace was damaged,probably dropped.When I bought the current one and down-loaded the program,the original data was lost.The project a year ago was to take a box of AA skeet shells,number them,fire all and record pressures.Then a member of the club was to reload them and then repeat,for about 10 times.I wanted to see if the shells had a reloadable life.However, life changes and I gave-up my FFL which was for gunsmithing (mainly doubles).Now,I am into,sorta, 1000 yd.with the .308.Really, go to the Pressure Trace site,click on products and there is a good discussion on the product,including some stats.Remember,there are:Lies,Damned Lies,and Statistics (Queen Victoria)
