IF you routinely refer to your manual while reloading, make sure that your manual remains open to the SAME PAGE... ... and just slipping in a page marker isn't adequate. Or copy the page that you're going to use and have only that on your bench. Amazingly (amusingly?) quite a few of my colleagues at the range reported catching such a problem in mid-reloading - and not known when the page turned. Starting over isn't always as much fun.