I did a fairly extensive experiment and found that the scale even with trickling is accurate to 0.1 grain. Still don't know exactly what the guy at Dillon was referring to.

Here is how the experiment played out.

I took 6 measurements at 30 grains and trickled up. After the scale read 30.0 I would re-weight the pan two more times. Generally the scale would re-read 30.0 grains. However on a couple it read 30.1 gr.

I also did the same experiment at 50 grains. It was more consistent at 50 grains than at 30. I believe I only had one miss read and it was high by 0.1 gr.

I had the intention of doing it at 70 grains but figured my findings were sufficient.

Tom