LEAD HEAD Pellet Sizer: How wide should the bins be? What is the probability of misclassification if you only measure once?

Not getting to shoot much right now following ankle surgery. So I decided to do some pellet sorting and also some replicate measures on the same pellets. I used a tin of 25 caliber JSB Diabolo Kings, upgraded the Lead Head with a 0.001 mm resolution indicator (Mitutoyo), and made measures in triplicate on 30 pellets followed by single measures on about 160 pellets.

The summary is posted on the Lead Head Pellet Sizer page. As soon as I can get out and shoot to check how it affects the precision and accuracy of the TM-1000, I will update the posting and summary.



Here is the Lead Head with updated indicator



Bins were established using the following criteria:


The probability distribution was shown to be normal of the 90 measures (30 pellets measured in triplicate)


The pellets were sorted into whatever the first measurement happened to be to reflect likely practices with this unit. The distribution of the measurements then of the pellets sorted into the bins (bin -0.03 did not have enough to really make a strong analysis yet) using a box and whisker plot shows that the groups do improve the overall pellet dimensions but that there certainly remains overlap using a 0.01 mm wide bin.