Do you think it's wrong? If you put a 150 gr. rifle bullet on the scale, what does it read? Try a .230 gr. 45 cal bullet also. Todays modern premium jacketed bullets are damn near exact weight. Cast bullets vary too much.
Some of the scales are self calibrating. Turn it on with the pan empty and if it reads 0 you are go to go. As said above weigh a couple bullets of known weight to make sure it's operating properly. HMB
a) With the scale turned on and without any weight on the pan, press and hold the "TARE" button until 'CAL-0' is showing.
b) Press the "TARE" button again. The '0' in 'CAL-0' will begin flashing.
c) When 'CAL-F' is shown, stack the two 50g weights on the center of the pan and press the "TARE" button. The 'F' in the 'CAL-F' will flash.
d) When 'CAL-0' is shown again, remove the test weights and press the "TARE" button. The '0' in 'CAL-0' will flash.
e) When the calibration is finished, the scale will reset.
NOTE: If an error occurs in calibration, the scale will try to re-do the calibration starting from step (b).
Thanks everyone, I knew someone here could help me. My scale kept weighing lighter and lighter. I finally figured out the tray was hanging up over the load cell. A little cleaning and Rem Oil cured it, but by that time I had the calibration screwed up.