Every November prior to deer season, my club opens its range so as to allow people to sight in their rifles. Several years ago a fellow showed up with a traditional caplock rifle with a huge telescopic sight mounted on it. He proceeded to load, cap, and fire it, BUT the 'scope went flying up and ultimately to the concrete floor. He was more than embarrassed by it. We never determined what load he was shooting (the gun was undamaged) nor did we ever see him again. Actually, this was funny only for a moment, sad really, but we had to wonder whether the scope mounting was done by himself or a professional (perish the thought!).