Actually, it's fairly easy to capture the bullet. The flash is triggered via a microphone connected to a device that lets you set the delay in milliseconds. So, we set up and aimed the rifle on a fixed stand. We measured the distance from the muzzle to the target we knew the muzzle velocity and the speed of sound and the distance to the mic, so it was simple math to figure out when the bullet would arrive vs. when the sound would hit the mic. There was a little bit of trial and error, maybe 2 or 3 frames where the bullet was not exactly where we wanted it.
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