After reading all the positive posts on the GD-503, I took the plunge and bought one. Per the manual, I turned it on for a full 24 hours before using. I placed the 100G calibration weight on the pan and it read 1543.235 GN...perfect. I did some testing and all charges weighed were +/- a kernel of H4350. I turned it off for a day, and per the manual, the next time I turned it on for 30 minutes to warm up before using again. I placed the calibration weight on the pan, and much to my surprise, I got a reading of 1543.215. I did this check over 20 times and never got the 1543.235 reading...all were between 1543.215 and 1543.185. Has any user run into this calibration problem with your scale. For 1K, this scale should be dead on EVERY TIME. If you can't calibrate it, you can't get load accurate ammo.
Paul form PA
Paul form PA