Observed arrival · 2026-10-31
Chronoless: muzzle velocity by listening for steel
Chronoless describes a phone app that estimates a rifle bullet’s muzzle velocity from the time between the shot and its impact on a steel plate, then uses that figure in a ballistic solver.
- For
- Rifle shooters measuring velocity at a steel range
- Worth noticing
- The site says shot markers can be corrected by hand if gusts or another firing lane confuse detection; audio is analyzed on the phone.
Field notes
The proposed workflow pairs acoustic detection with a measured shot-to-steel distance, then accounts for sound travel and conditions including temperature, pressure, and wind. The page says users can correct a shot marker if a gust or nearby firing lane causes a false detection, and can substitute readings from a handheld weather meter. It describes offline operation for the chronograph and solver, while current-weather lookup needs a connection.
Observed signals
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