A nice bright sunny day with a dozen 9mm cast loads to chronograph. Nothing is working right. First screen reports missing the shot. Last screen reports no shot. Chrono sees nothing on some shots. Wild velocities reported. Checked all the connections, problems still exist. Standard velocity 9mm test ammo gives variable results - some correct. Jacketed 9mm not any better. Muzzle blast problems? Moved screens, more variation. Using up limited test ammo, not enough good data for standard deviation determination. Pulling out hair, not much hair much left.
Tried 22 LR pistol to try trouble shooting. Cheaper and lots of 22 ammo. Chronograph gets religion, all shots record perfectly, velocity is correct.??????
Dark colored 22 bullets record perfectly. Nice shiny cast bullets are awful, jacketed 9mm not much better.
Solution: Magic Marker on nice clean cast bullets. They look ugly, chronograph likes them.
The shiny bullets show no (or low) change in light intensity over the photo cells.
Problem solved, hair will grow back (I hope)
Steve
