I have been reloading for about a year now. My daughter gave me a F1 chrony for xmas. So I got to try it out today (cloudy, no sun) and have some issues. Loaded 10 230gr Hornady FMJ RN with 5.8 and 10 with 6.0 Unique.
For the 5.8 I forgot the 1st 3 readings but the last 7 were 622, 609, 754...