Hi DL, I Record my loadings in my (now) tatty old notebook and Duplicate on an Excel spreadsheet which holds more information ie. Weather conditions, wind direction and bullet velocities if using the Chrono.
I Note when using a new batch/ different powder or bullets etc.
I always Zero 1" high at 100 yards so don't usually keep my targets.
Just a notebook with calibre, case, powder, primer, bullet, COL, what rifle the round was for and what groups were produced. Also date and time loaded. Sometimes keep the groups if I need them for reference.