Data Book
Also: DOPE book · Rifle log
A written record of every shot fired: load, wind, atmospherics, dial settings, observed impact. The institutional memory of a rifle.
A precision rifle data book ledgers every range trip: date, temperature, pressure, humidity, wind, load specifics, dial settings used, and shot-by-shot results. Patterns emerge over time: how this rifle behaves at high DA, which load is most temperature-stable, where your zero shifts seasonally.
Modern shooters often mix paper books with phone apps for atmospheric capture. The data book itself remains worth keeping. Physical records have a way of getting revisited that JSON files don’t.