I keep hand notes on load development in a hard bound field book - the type surveyors will use to collect data. My targets are saved, and every couple months I'll set down and scan the targets and "file" them on my hard drive. My files are set up firearm/bullet type-weight/powder. I always document my load data on the targets before I leave the range (ie COAL, primer, case prep, bullet, charge, atmospheric conditions).
