Caliper reading variability

[Labrat198]

So just to revisit now that I have the Hornady gauge and did a slightly larger set, I've got some numbers.

15 resized with multiply firings measured 3 times over 3 days:

SD= 0.001091
Spread= 0.0050

Largest Spread for a single case was 0.0010

5 Hornady Black 1 fired not resized measured 3 times over 3 days:

SD: 0.001077
Spread: 0.0035
Largest spread on a single case: .0010

control group 10 new out of the box hornady black

SD: 0.00041
Spread: 0.0010
Largest spread on a singe case 0.0005


So it looks like my calipers and methods are good. Learned something new about variability in the cases.