H & H Concentricity gage or Bersin or ???

Aldon

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It looks like some of the information I wanted is on this thread. http://www.longrangehunting.com/forums/f28/case-bullet-run-out-how-big-deal-51973/

It is more important to determine what is causing your runout so you do not need correction in which case, the Sinclair equipment seems to be everyones favorite, but I like the idea of tweaking the occasional round as well.

So it brings me back to the discussion I started. What tool is best for minor run out correction.....?
 

J E Custom

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I am shopping for a good concentricity guage that allows me to correct small errors as well.

Does anyone use the H & H concentricity gage? Concentricity Gauge

How about the Bersin?

http://www.centuryarms.com/bersin.pdf

Does the other well known makers such as Sinclair allow the correction of small errors?

Thanks

Both of those look good and you might also look at the Hornady .They are very affordable.

I have one and it will fit every thing but a 50 BMG and I have good luck correcting small
errors in re loading and in factory ammo also.

It can be set up for different types of measurements. I use mine to check the entire length
of a cartrige for any inconsistencies.

J E CUSTOM
 

Aldon

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Thanks JE, I will take a look at the Hornady set up.

Affordable is a good trait as it looks like I am going to spend a lot of money with Sinclair:)
 

Mikecr

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I obviously don't like ammo-benders.. But of the two this is what I see:

-The Bersin purely shows seating errors, and or neck offset, while eliminating all else from measure. It's adjustment focuses on seating error resolution.
-The H&H brings more total runout into the picture, but still masks most from measure. It's adjustment is the same as the Bersin, but would correct a touch of 'banana' from the case as well.

So of the two, I would go H&H.
 

Gene

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I know nothing about the H&H. I have a Holland concentricity guage which is much like the Sinclair.

Bought a Bersin some years ago. It does measure concentricity, but they tout its ability to straighten bullets. The bullet can be moved somewhat after seated, but all you are doing is stressing the neck, so the next shot from that case is even more exaggerated. I sold lit.

Cases come out of the sizer die lacking concentricity and that is where you need to start. You need to remove the expander plug if you use one. Either use bushing dies or have a custom die made for a good chamber fit and you can throw away the concentricity guages. Send Harrell's $70 and two fired cases, and they will make you a custom fit die.
 

Aldon

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Thanks guys!

I like the idea of custom die.

So the ideal would be to use the Sinclair gages to stay on top of the loading process and get good custom dies made to limit/eliminate the liability.

Now I have to sell some stuff to afford all this without impacting my new build:)
 

Bart B

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Folks have been trying different ways to bend bullets in rounds with too much runout for years. Every one of them involved pushiing on the bullet to straighten it up. Not a good idea in my opinion.

My own tests have shown that such " bullet straightening" hurts accuracy. The bullet's been bent enough in the case neck that it's held with a different amount of tension. If you want to straighten the bullet, you had better straighten the neck, too. Bullets are aligned with the case neck axis when they're seated. I don't think that should change.

I've taken 30 caliber ammo and put their necks in a .338 diameter bullet puller with the high point of runout marked on the case so it's where I can press on it. A little practice tells one how much the case has to be pushed to bend the neck just the right amount. Tighten the collet just enough to hold the loaded round case neck firmly, not tight enough to size the neck and bullet down.

Shooting such "neck straightened" ammo shows only accuracy improvement. Use a bullet puller collet of the right size. If one's not available, well, maybe you could make one or fashion a collar to put over your case necks to fit a collet that does work.

Use gelded full length sizing dies (no balls) and your case necks well be much straighter. Depending on how the case is referenced (rested?) at its contact points in the runout tool, the numbers will vary. There's no such thing as a perfectly round case (chamber either, for that matter). Especially when V-block types are used and the out-of-round condition at the case shoulder will corrupt any reading one gets.

Tool and die experts dealing with metrology and precice measurements of mechanical things will tell you that the best way to support a cartridge to check it for bullet runout is in V-blocks touching the pressure ring and datum line about mid point in the case shoulder. These are the two points on the case that position it in the chamber. The extractor pushes the case sideways so the pressure ring stops against the chamber at the back end and the case shoulder centers in the chamber shoulder as it's pushed there first by the plunger style ejector and second by impact from the firing pin.
 
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Hogan

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Its probably right here in front of me, but I don't know where to check out and maybe buy an H & H Concentricity Gage online.

Does anyone out there know?
 

Hogan

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Thanks Aldon. I am having problems with flyers every once in a while [you never know when] [7mmWSM].
I am hoping this will help or fix my problem
 

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