Mine is a Lyman 1000 grain electronic scale, bought brand new in November. I calibrate it before every session and check it with check weights. Ill get it where I feel good about it and start charging cases and sure enough 15-20 cases in I知 having problems. Here痴 how mine works:
I値l pick the empty pan up to throw a charge and the scale will read -115.5 gr. I値l throw a charge in the pan, place the pan on the scale, trickle till I知 happy with the charge weight, (I usually set my powder measure up to throw a little light), then I pick the pan up to pour the charge into a case and repeat the process. Ill glance down at the scale before throwing another charge and now the scale reads -115.7 grains! It seams that darn thing varies between -115.7 and -115.3 (or +/- 0.4 of a grain). It痴 gotten so bad that I知 now in the habit of picking a charge that I知 trying to load and basically calling it good enough if I can get the scale to read within one or two tenth's of it. Pretty frustrating.
I was thinking it was just a fluke scale or maybe the air currents in my garage were somehow messing with it. Perhaps there is a little more to it??
Anyone else have similar issues?