Doesn't work that way. It does not measure deficiancies like you are thinking. It mainly allows you to pick out anomoly bullets and sort your bullets into uniform groupings.
You use one bullet to establish the norm with a measurement of what is called Deviation Units (DU). You want no more than 1 DU variation as you spin the control bullet.
I always found one bullet that measured a 1 DU and kept it for my control bullet to zero the Juenke each time. I kept the control bullets in a little tube with the machine setting (what it measured on the DU scale) marked on it and reset the scale to the same number each time I used it.
For example a control bullet measured a 20 on the scale when I originally measured it. the next time I would zero the Juenke to measure 20 again on the same control bullet and then go sorting the other bullets measuring their DU variations and sort them into DU groupings. Then you knew that those bullets in that DU grouping were uniform. You reloaded using one grouping of bullets at a time.
Any bullet that spun over 5 DU variance was not uniform enough for a group normally. They were used for testing, sighters etc
I have seen a factory box of bullets vary as much as 20 DU spread and very few that would be a consistent 3 DU or less.
A Juenke really helps sort the anomoly bullets out of the box and to sort the bullets into uniform groups.
If you are manufacturing bullets, testing only two will not tell you how uniform your process is. They could be two at opposite ends of your tolerance span.
BH
(nearing is a relative term).
