rcmodel
Member in memoriam
I know because I check my dial calipers against my Starrett carbide face mic's 1" Gage Block Standard that came with it about 40 years ago.I'm not arguing that anyone's caliper is inaccurate, just asking how you know.
But if I measured 5 Sierra or Hornady .308" bullets and one came out .3089" and the next .307", I would first be concerned about my calipers health & welfare, not the bullets.
But as walkalong said, we ain't making parts for the Space Shuttle here.
rcmodel