Originally Posted by J E Custom
This is when I check for total indicated run out at the bullet ojive while restraining the bullet tip and case head
Why on earth would you 'restrain' what you're trying to measure?
You're masking variance. This is why your numbers are so low.
Sounds like you're using a concentricity gage rather than a Runout gage.
As a note, the Sinclair 'Concentricity' gage is actually a 'Runout' gage.
Why are you guys FL sizing NEW brass & culling by runout?
New brass could measure any runout, even if turned, until it has been fire-formed into it's final product.
#1 Stop FL sizing new brass. It is wasted time.
#2 To see your brass at it's lowest runout(it's best potential), measure it after fireforming, & before doing anything to it.
#3 Measure after each sizing stage to see the specific runout contributor
#4 Measure loaded runout off the ogive at a point near land contact, with the bullet unrestrained. Don't assume anything about the neck, or even think about it at this point.
Think TIR off the ogives.