The only chronograph I've shot was a Shooting Chrony, which happened because I had it set up 20 feet away because a .416 Rigby's muzzle blast affected the results when set up closer.
After shooting the .416, I started testing an S&W .41 Magnum revolver. This worked fine until I tried some light-bullet (170 grain?) loads, forgetting that point of impact can vary considerably with lighter bullets, usually lower. The first one center-punched the Chrony, and I eventually decided that was more than OK, because I'd owned three of them and they were the most erratic chronographs I've ever owned, out of a total of around 10.
