Vern Juenke ICC unit

[Jimbo27]

I acquired one of Juenke's units and wanted to get some opinions from anyone who has one on the proper use of the machine. I guess I am a bit confused when actually evaluating the bullets.I have several questions on the set up using a "reference bullet" to use for comparison.

 

[Preacher]

With mine I have bullets set aside that I use for checks, one for each weight and brand.
I came up with them by checking all in the box, and then segregating them into groups
and storing one of the ones that was the most consistent for the next time.....

 

[jeffreybehr]

Rifleless newbee here. What's an ICC unit? Something having to do with the late Interstate Commerce Commission?

 

[BountyHunter]

Jimbo

I keep my reference bullets in little plastic tubes,Sinclair sells them .50 each) with the ICC DU number written on the side in magic marker or you can label the tube. That way I can zero the maching right to the exact bullet or case I am using as reference at the exact DU it showed before.

When I do it like that, the DU measurements are consistent from batch to batch.

If using the ICC to sort cases, they must be fired and cannot be resized.

Jeffrey

I think that there is an article her in the blog archives on the Juenke. 21 Dec 06

BH

 

[jtm]

how do they work principle i mean is it measuring run out or somehow case thickness

 

[Preacher]

To be plain and simple, it just a balance thing.
It's a mass metal spectrometer that isolates metal mass......

 

[jtm]

bit like a wheel balancer i spose thanks jim

 

[EricStecker]

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.

Regards,
Eric

 

[jtm]

THANKS ERIC i shoot short and will wait
jim

 

[jimm]

Thanks Eric ,

Good response all round . Looking , weighing , checking every aspect with no preconceived notions spoiling the data .

Jim Brown

 

[JERRYHM]

I watch some one use a Juenke and I offered to buy all of his rejects and shoot them against him, the offer was declined.
Jerry

 

[Preacher]

I would not have declined that offer at 350 yards and over !!!!!!
We would have to use something other than Berger's as there are very few that are not consistent...

 

[AlNyhus]

I think the best bullet tester on the market is the 'Gyroscopic/Dynamic Stabilization Direct Feedback Unit.' For my .30 cal. BR work, I use the '1:17' model. Other may opt for the 1:8, 1:14, etc. -Al

 

[mikecr]

The problem with your 'Direct Feedback Unit', is in it's complete disassociation with standards,much like bullets). It's a whole new ballgame from one to another, and it will not predict anything.
They don't last long enough either..

As Eric pointed out, the Juenke does not measure cores. But I know of no claims that it would, so I assume it's not suppose to.
It measures jacket thickness variance and dimension variance in bullets, as it does with brass.

Many have reported that 'Gems' shoot truer.
I believe them.

 

[AlNyhus]

The problem with your 'Direct Feedback Unit', is in it's complete disassociation with standards,much like bullets). It's a whole new ballgame from one to another, and it will not predict anything.
They don't last long enough either..

Mike I know that's a popular opinion regarding barrels. But quite honestly, my experience has been quite the opposite.

Good shootin'. -Al

 

[jtm]

Gday Al What is this gyroscopic machine what does it do & how does it do it .Is it a version of the machine in riflr acc. facts. If so were do ya get one & how much TONY BOYER aint waitin to be caught he must be some kind of machine i want one of them as well
thanks mate
regards jim

 

[mikecr]

Al's 'Gyroscopic/Dynamic Stabilization Direct Feedback Unit' is the rifle barrel.

I don't expect one to be any better than another.

 

[jtm]

good one im crying laughing thanks fellas

 

[AlNyhus]

Glad you got a chuckle out of it.

Good shootin'. -Al

 

[jtm]

Al what is your opinion do we go over board with gizmoz.