Never trust an adjustable powder measure. That being said, next year I will have a 40gr powder measure to load the short rifle for the Youth Field Day. At the end of the day, with the last group of youth shooters watching, I overcharged the rifle they were to shoot. As soon as I saw my reference marks on the ram rod I knew that the rifle was overcharged. Sooo I turned to the group and said I will shoot this load, not telling them what had happened. The subsequent roar of the half stock fifty and recoil number it did on me made a big impression . When I checked my brass powder measure, the lock nut had loosened and allowed the piston to fall to some'eres around 120 grs. When I poured the charge in I got my first clue and seating the ball confirmed it. This was after a long day and charging the little rifle over 100 times for the youth to shoot my buffalo target. Thankfully I religiously checked the ram rod witness marks all day, each time, every time I loaded. Old habits saved a young shooter from a nasty recoil, and made me wake up! I tried to concentrate while loading all day, and thankfully, I caught my one slip up. We had a good turn out and many compliments on our demonstration and conduct of the muzzle loader station. And I give a special thanks to "Man Above" for keeping everyone safe.