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H & H Concentricity gage or Bersin or ???

 
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  #8  
Old 02-20-2010, 08:21 PM
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Re: H & H Concentricity gage or Bersin or ???

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.
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  #9  
Old 02-20-2010, 08:57 PM
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Re: H & H Concentricity gage or Bersin or ???

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
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“When a long train of abuses and usurpations, pursuing invariably the same object evinces a design to reduce them under absolute despotism, it is their right, it is their duty to throw off such governments. …” Jefferson

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  #10  
Old 02-21-2010, 09:46 AM
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Re: H & H Concentricity gage or Bersin or ???

That's a solid plan Aldon
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  #11  
Old 02-21-2010, 06:13 PM
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Re: H & H Concentricity gage or Bersin or ???

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.

Last edited by Bart B; 02-22-2010 at 08:20 AM.
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  #12  
Old 03-15-2010, 08:53 PM
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Re: H & H Concentricity gage or Bersin or ???

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?
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  #13  
Old 03-15-2010, 09:10 PM
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Re: H & H Concentricity gage or Bersin or ???

Here you go:

Concentricity Gauge

Aldon
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“When a long train of abuses and usurpations, pursuing invariably the same object evinces a design to reduce them under absolute despotism, it is their right, it is their duty to throw off such governments. …” Jefferson

We are very close to this point now.
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  #14  
Old 03-16-2010, 05:16 AM
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Re: H & H Concentricity gage or Bersin or ???

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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