Vern Juenke

A

Alastair

Guest
Does anyone have any contact details for Vern Juenke?

I've tried searching for "The Accuracy Den" but the web page isn't there anymore.

Thanking you in advance.

regards

Alastair
 
Vern is old, sick, and not making anything anymore. His wife won't even put you through. A used machine is your only option. Bear in mind there is considerable difference of opinion whether or not the machine works, at lest as promoted. I do use one, but not to check bullets "as advertised."
 
Thanks Charles, has anyone else tried to make something similar to his machine?
 
a lot has been written about it. Some say it works, I have something I picked up to check jackets
It works fairly well but needs work. I was told the best way to spin bullets is down the barrel.
 
GerryM said:
I was told the best way to spin bullets is down the barrel.
Click to expand...

Gerry
No Question in my mind that is the best way to test everything about how good a bullet is.
Unfortunately by the time that method tells you it is a bad bullet it is a little too late.

Dick
 
I’m not sure how to begin this post but please understand I’m not trying to be callous or uncaring.

Moderators please delete this thread if it causes too much grief.

Perhaps if I relay a similar story it might help others to understand where I’m coming from.

A few years ago there was an excellent tailor in Sydney that made very good motor cycle leathers and shooting jackets. He worked very closely with members of both sports and was well known for the quality of his product and his service. Unfortunately he fell sick and never returned to his business.

When his family was settling up the business, as there was no one else to carry on, all of the patterns and notes he used to make the motor cycle leathers and shooting jackets were burnt “to get rid of all the paper”.

This left a significant hole in both sports and when I relayed the story to another motor cycle leather tailor in Brisbane his recognition of the loss of all that knowledge was palatable.

If I could be so forward as to ask someone who knows the family well that maybe Vern’s knowledge and contribution to the global shooting community could live on through royalties gained from the ongoing production of his machine.

Respectfully

Alastair
 
True Dick but thts why we practice and find out what works The wind is the deciding factor.
I have a tool for spinning jackets to check for run out. it measures in the 1/10000 but it still needs work.
Really I don't know how much or how little much or how little that point really relates to accuracy.
The jacket we have been getting lately are outstanding so are the bullet dies. Total runout in our finished bullets is
in the millionths
 
Brief synopsis: My opinion, backed by some empirical testing, is the Juenke machine does an excellent job showing the form of a bullet, at the points under the head. It may or may not give an indication of jacket wall variation. It does not show any internal problems with the lead core. Eric Stecker of Berger bullets did a test reported (at least) on 6mm BR.com

We tested the Juenke checker to see if the Juenke could detect voids inside the bullet. First, we marked an empty jacket with a sharpy on the outside to keep track of the relationship between the indicator read out and the position on the jacket.

Then we spun the jacket with nothing inside. The needle moved five deviation units. Next, we place a loose core inside the jacket. The needle moved five deviation units and the needle moved to the same position as it did with the empty jacket (in relation to our sharpy mark. Our last test was to take a toothpick are shove it down the inside of the jacket next to the loose lead core. This held the loose core to one side of the jacket. We spun this jacket with the core wedged off to one side and the needle moved 5 deviation units and was consistent with the position of the jacket in the previous two tests.

I am convinced that the Juenke checker can tell if the bullet is round and straight in relation to how the bullet sits on the ball bearings. This can be helpful and it is difficult to argue with some folks who can show that bullets with low deviation units perform better on the target (mostly long range). I am convinced that the Juenke checker does not look inside the bullet at the density are it would have acted different when we wedged the core to one side.

I am not saying you should not use it or that it is not worth owning (we have one and use it as a reference) but am merely sharing the results of our testing.
Click to expand...

As I remember, several short-range bullet makers used the machine to sort their bullets. When they tested the bullet sorts by firing at targets, they found no correlation between "high-deviation" bullets and group size.

A number of long-range shooters (me included) have found the sorts useful. Of course, much depends on what part(s) of the bullet one measures.

OK, form is not terribly important in short-range BR. It is terribly important in 1,000 yard BR.

I wish Mr. Stecker had done a controlled test on jacket wall variation, but he did not. So far, to my knowledge, we have only one independently verified known use for the machine, and that is measuring the form of the bullet at certain places.
 
I really doubt if any thing as plastic as a lead, and copper bullet would have run-out in the millionths, or the same diameter for that matter. If it did, you are not going to measure it at your loading bench.
 
B.Johnson said:
I really doubt if any thing as plastic as a lead, and copper bullet would have run-out in the millionths, or the same diameter for that matter. If it did, you are not going to measure it at your loading bench.
Click to expand...
Perhaps. But that's not what I measure. I measure how concentric with the shank the boattail is, how long the shank ("bearing surface") is, and how long the nose is. The first affects center of mass, the others are known factors in a bullets form (i.e., "B.C."). I then trim meplats and re-point the bullet. Carefully. I can shoot the difference at 1,000 yards. You may think it is all in my head. I don't. But in any case, my reply is "So what?"
 
The bullet were tested for runout on avery sophisticated machine at a medical equipment company of high respect.
I'm not dreaming this up. I still have the measurements on the finished bullets at certain points including the base Pressure ring,
 
You must log in or register to reply here.
Back
Top