Bob Wright
Well-Known Member
Which would insinuate the entire body of the bullet varies by .005.I measured 15 bullets (with a caliper and Hornady gauge) that were machined with a modern CNC machine. As you can see, despite the type of tooling enhancement, there is still a .005" spread. I plugged the numbers into an SD calculator (https://www.calculator.net/standard-deviation-calculator.html.), and below is the finding.
View attachment 408431
In that sample. A disaster for the reloader and rifle.
Sounds like a Gage Repeatability Study ought to be done first with multiple operators in play.