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Tool for bullet run-out & neck thickness?

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  #8  
Unread 07-28-2009, 05:26 PM
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Re: Tool for bullet run-out & neck thickness?

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Originally Posted by SQ Stalker View Post
That might be an option. Where can I find the NECO tool?

Ideally I'd like to check neck variations w/ a dial indicator while turning the case. I'd think this would give more info than just a mic.

Also which is considered more important to group size, Bullet run-out or neck variations?

Thanks

Stalker
Herewith
Concentricity-Wall Thickness & Run-out Gauge, NECO Shopping Cart/Info Guide
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  #9  
Unread 07-29-2009, 01:45 PM
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Re: Tool for bullet run-out & neck thickness?

Thanks for the suggestions. If you could only afford one right now would the concentricity tools do a better job to eliminate flyers/help accuracy?

Then later get the tools for neck variance?

Also with a factory barrel will sorting either of these variables really have an impact? Or would it be wise to wait until next year when I get a custom barrel and then start looking at neck concentricity/ bullet run-out and neck variances?
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  #10  
Unread 07-29-2009, 03:10 PM
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Re: Tool for bullet run-out & neck thickness?

Quote:
Originally Posted by SQ Stalker View Post
Thanks for the suggestions. If you could only afford one right now would the concentricity tools do a better job to eliminate flyers/help accuracy?

Then later get the tools for neck variance?

Also with a factory barrel will sorting either of these variables really have an impact? Or would it be wise to wait until next year when I get a custom barrel and then start looking at neck concentricity/ bullet run-out and neck variances?
I'd say to get the concentricity gauge, you can address a lot of concentricity issues without purchasing additional tools. About the only thing you can do to address neck thickness issues is to either get different brass or turn your necks. Turning necks isn't normally indicated unless you have a custom chamber.

AJ
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  #11  
Unread 07-29-2009, 03:16 PM
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Re: Tool for bullet run-out & neck thickness?

Roll your loaded ammo across a glass topped table. If you can't find discernible run-out, you don't need a gauge.

Variation in wall thickness is best cured by purchasing better brass, or simply culling lesser brass. The ball micrometer is the proper tool. Both Lyman and Graf have an inexpensive one, probably out of the same Chinese factory.

If the sizing stem in your die is crooked, it will bend the brass necks. Straighten the stem or use a Lee collet die (possibly fraught with its own ills). If the bullets aren't seating straight, seat in steps while rotating the cartridge.

Your wisest purchase at the moment would be Glen Zediker's Handloading for Competition. Get it before you build a custom gun. A factory rifle is not going to respond very much to tweaks. Making sure you have straight ammo is probably the most important. Variation in wall thickness influences neck tension. Centering the cartridge in a factory chamber won't gain anything. The necks are turned to fit brass to a custom chamber, and with good brass no-turn chambers are gaining favor.

After you've moved to a custom barrel, more involved techniques will prove their worth.

Last edited by Winchester 69; 07-29-2009 at 03:19 PM.
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  #12  
Unread 07-29-2009, 09:35 PM
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Re: Tool for bullet run-out & neck thickness?

I think I'll get the sinclair tool when funds permit and go from there.

What is an acceptable run-out for a seated bullet?

Thanks

Stalker
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  #13  
Unread 07-29-2009, 09:59 PM
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Re: Tool for bullet run-out & neck thickness?

Quote:
Originally Posted by SQ Stalker View Post
I think I'll get the sinclair tool when funds permit and go from there.

What is an acceptable run-out for a seated bullet?

Thanks

Stalker
I seperate anything that is .002" or greater total runout (actual runout would be 1/2 of that). I spin the bullet and if the dial varies more than .002", the brass is marked and it is stored seperately.

Before I got the concentricity gauge, I had some reloads that shot lights out in my 7mm Rem Mag. When I got the gauge, I measured them and they were out as much as .008" but still shot around 1/2-3/4 moa. I looked at my process and got the runout down to .002" or less and have shot a couple sub 1/4moa groups since then!

AJ
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  #14  
Unread 07-29-2009, 10:45 PM
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Re: Tool for bullet run-out & neck thickness?

Sounds good. Now I gotta find some funds
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