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Neck Concentricity Help

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Old 08-12-2008, 08:40 PM
Silver Member
Join Date: Mar 2007
Posts: 430
Re: Neck Concentricity Help

Originally Posted by esshup View Post
If I leave the expander ball in the die, I get 0.004+" run-out. If I take the [expander] ball out, the run-out is 0.001" to 0.0015".
How does the measurement w/o the expander ball vary when you rotate the die?

One scenario points to the expander ball/stem, and the other suggests it's the die.

You might experiment further using a split lock ring and/or a rubber O-ring under the lock ring. Different shellholder?
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Old 08-12-2008, 10:17 PM
Gold Member
Join Date: Mar 2008
Location: N. Central Indiana
Posts: 550
Re: Neck Concentricity Help

I've come to the conclusion that it's the expander, and here's why. Please correct me if my thinking is flawed!

I have neck sized .300 Win Mag using the same shell holder and can hold .001"-.0015" TIR, so that leads me to think that it's not the shellholder. I can neck size in the .257 die without the expander ball and get .001"-.0015" TIR. I take that same cartridge, force the expander die into it, (liberally coating the inside of the neck with Imperial) and get the familiar .006" TIR. I can partially neck size the brass, rotating it slightly every time I run the brass deeper into the die, but measuring after the final pass still nets me .004" - .006 TIR. Fired brass runs .001" TIR from both guns, both Weatherby and Norma Brass.

I can rotate the shellholder at all "hour" positions on a clock face, neck size with the expander ball out and get .001"-.0015" TIR.

I ordered a new shellholder, "S" type bushing neck sizing die, and .280 thru .284 bushings today. They should be delivered Thursday. I'll fireform via COW the brass that I boogered up to get it straight for the new die. I'll bet I have over 50 pieces of virgin brass to fireform tomorrow.:( I wonder how Kirby's PK brake will like COW?

BB: The shellholder is held pretty tightly with the c-clip ring, and it won't rotate unless I turn it manually.

Guys, your insight into this problem has helped greatly - THANKS from the bottom of my heart. I have learned some new things fighting with this problem, and I will file the info away. I'll let you know how things pan out with the new die.
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Old 08-13-2008, 06:32 AM
Platinum Member
Join Date: Jun 2001
Location: Potomac River
Posts: 5,057
Re: Neck Concentricity Help

Take the C-clip off. Use a rubber O ring to keep it lightly in place. This will allow it to float with the case.
The Smokin Fur Rifle Club
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Old 08-13-2008, 10:18 AM
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Join Date: Mar 2008
Location: N. Central Indiana
Posts: 550
Re: Neck Concentricity Help

BB: Will do. Thanks
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Old 08-13-2008, 09:35 PM
Silver Member
Join Date: Aug 2008
Posts: 171
Re: Neck Concentricity Help

I hate to say it, but I would buy another die. Get a redding bushing die. I rarely ever get more that .001 of run out in any of the 5 guns I use them on. With the right bushing, you can remove the expander ball, get lighter uniform neck tension and remove most of the run out. I also use a Bersin ammo fixing tool. I can take a round with .002 down to point .0005 in about 30 seconds. I run every round I reload thru it except my step sons 300RUM, it's too big. I ingnore anything .001 or less and I fix anything that is greater than .001.

Last edited by Robbin; 08-13-2008 at 09:37 PM. Reason: Sorry, didn't see your post where you had a bushing die already.
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Old 08-14-2008, 07:56 AM
Bronze Member
Join Date: Dec 2003
Location: S.W.Pa
Posts: 85
Re: Neck Concentricity Help

I take the expander assembly out and size the case then I use a lyman m-die to open up the neck. This usually cuts the run out in half.
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Old 08-17-2008, 07:14 PM
Gold Member
Join Date: Mar 2008
Location: N. Central Indiana
Posts: 550
Re: Neck Concentricity Help

The bushing die came Friday, and it seems to have solved the problem. My question is: Do I have to use the expander ball that came with it if I punch out the primers before I neck size?

It also came with an expander ball that is way too small - I'm guessing that it's to protect the collet that holds the pin if I'm not using the expander ball to open up the necks. The instructions didn't mention the 2nd, undersized expander ball.
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