Originally Posted by boomtube
"When I say "this bullet shows .002" runout" I mean the total swing of the indicator needle is two thousanths."

No matter how we "measure it", to a machinist that's TIR (Total Indicated Runout), which is twice the actual runout. Doesn't matter what we call it, what we want is to make it "0"! smile


+2

I've taken to calling it "Total Indicated Runout" or TIR just to be correct. Like boomtube says runout is not something exclusive to reloading and machinists have been measuring it forever.

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