A level 2 bullet sorting question

I've got a question.

Lynn, a couple times you've mentioned trimming meplats and checking on the Juenke and seeing no change. Where do you run the pickup on the Juenke that meplat trimming could affect the reading?

al
 
Alinwa
If I run bullets with real good meplats on them like the new Hornady 6mm hpbt I get the same readings after trimming as before trimming,If they measure 15 deviation units before trimming that is what they measure after trimming.

If I spin Clay Spencer 103's on the Juenke and find bullets with more than 5 deviation units trimming the meplats will bring them under 5 deviation units.I sort to a single deviation number.

I am running the center of the bearing surface on the 4 bearings with the stop moved so it contacts the bullets heel not the meplat.
The pickup is fixed in place under those bearings.
I put a little red line on the boattail to bearing surface junction so I can make sure the bullets are not slipping.A little laquer thinner/reducer put on the rubber with a Q-tip will make the rubber real sticky and prevent slipping.
If I then point the bullets without measuring the bearing surface or boattail to ogive most will go from under 2 deviation units to over 20.
For the nationals this year my father will be shooting 3 Dashers and all of his bullets will be under 2 deviation units.Roughly 400 bullets as he doesn't shoot the F-class bench event.
Lynn
 
Alinwa
You can measure just about anywhere you want but you need to keep the bullets held in place while they are spinning.
I didn't want to glue all sorts of bearings onto the machine.
If I knew how to post a video on YouTube it would be easy to show.
Lynn
 
I understand, I have a Juenke. I just can't see how trimming would affect anything I measure....

al
 
Alinwa
If you have some good custom bullets that are measuring less than 5 units and while your measuring them you get a couple that exceed 10 deviation units trim the meplats and re-measure them.
Most bullets don't show an improvement from trimming but when your running good bullets and see an anomaly trimming can fix it.
Lynn
 
alinwa If you remember form school, For every action there is a reaction. Thats why you make one change at a time till you figure out what it does!

Joe Salt
 
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