His manual will not list the instructons for checking cases I do not believe. Read my original post and remember must be fireformed and not resized. I have seen that proven without a doubt that it works for cases.
I keep my calibration bullets and cases in little plastic tubes with the Juenke reading on them and it is easy to recalibrate the machine to that bullet/case reading so that your bullets from different lots or batches will read the same as a previous lot.
Be interested in seeing what you come up with as far as the validity of what Vern claims his machine will do.
The manual has the info on the cases, pretty interesting read too, you want me to send you the pages related to cases or the whole manual, let me know. I think the manual is well written and spells things out really well for a guy that doesn't even comprehend what's setting in front of him. Once you read them, it all becomes all too simple. I explained and showed my Dad how to use it in less than two or three minutes.
Here's some thoughts and data for some bullets I tested that I sent to Len in an email, I thought I already posted it here too... whoops!! [img]images/icons/smile.gif[/img]
More later, but so far the 200gr Accubonds all tested under 9 DU's on the shank, half were under 4 DU's, the other half were 8 DU.... not bad, I thought. The 178 A-Max's I checked were in the same range too. All 10 .338 300gr SMK's I checked were all less than 3 DU's.
I've made a couple observations so far; A couple things can cause higher DU readings than it really is because of the tip or base length variations can cause the bullet to move left or right on the balls varying the distance to the detector head if it is not level, as with testing boattails or ogives. If it was not distance sensitive, this would not matter but, it is and is something to consider.
I thought of making an vertically adjustable stop that fastened to the originals lock-down screw that would center on the bullet bases axis to elliminate it from riding the stop on the heal of the boattail, this would keep the heal irregularities from influencing the distance to the detector, as it should remain stable from lft to right.
With the bullet tip to the left against the stop and setting at quite an angle to test ogives, I can see no way to correct for variations in irregular tip length like you get with the SMK bullets.
So many ways to sort them all, a guy might end up with many, many DU batches in just one box of a hundred.
Dave Tooley sells a tool ($40) that cuts the bullet tips/metplats uniform and true based on a distance up off the ogive. They are caliber specific, ie 6mm, 6.5, 7mm, 30 and 338 and not interchangable. Steve Shelp uses them and likes them a lot, particularily on the 338. That would allow you to get the uniform distance you are talking about if you wanted to go tip to the left.
As for so many DU units, now you see why guys who use these do it in lots of at least 1000 bullets in order to get quantities in each group. However, you might try other bullets, think you will find that the SMK is all over the chart, while the JLK and Berger are better, with the JLK being best.
Way I have always seen it done is to use calibration bullet and base to left, then calibrate the machine for the calibration bullet to set the norm of the group. Most guys using them end up with 6-8 groups on bergers and a handfull out of oddballs and max 2-3 DU groups with JLK. Sierra can end up with 10-15 groups as routine. They tend to sort by groups of 5 units, ie DU 11-15, 16-20, 21-25 etc.
Buddy of mine just finished spinning 1000 Clinch River 216s (30 cal) and max deviation was 3 DU. Best he has ever spun. 95% were within 1 DU he said.
When I researched these a few years back I learned Juenke was no longer manufacturing these units. A person would have to pick up a used one from someone that's getting out of the reloading hobby. They sounded pretty neat - but expensive. It would be fun to pick a used one up at a discount at some time or another.