Knowing your calipers

[explorecaves]

I'm interested to hear what some of you with industry standardization experience have to contribute, as well as those like LR1955 who have been reloading for decades.

One rule of thumb is to always zero out your calipers before taking a measurement. This involves:

1. Wiping the caliper jaws clean,

2. Closing the jaws to mechanical zero,

3. Confirming that the gauge indicates "0".

4. Take your measurement 2-3 times

5. close jaws to mechanical zero

6. confirm zero was maintained (too much pressure while measuring will cause the zero to drift)