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Help with runout

 
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  #1  
Old 01-17-2009, 04:37 PM
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Join Date: Nov 2008
Location: Eastern Montana
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Help with runout

I apologize if this has been covered before. I tried a search and nothing came up.

I am getting run out on my 7mm Rem mag and I don't know why or how to eliminate it. My gun definitely likes loads with less runout. I seperated some rounds into "non-noticeable visible runout" and "noticeable visible runout" using a hokey set of v-blocks I made because I don't have a gauge.

Groups with the noticeable were 0.450" and without were 0.280" I confirmed this with three trials.

I am using an RCBS rock chuck press with Remington Brass and a Lee Collet Die set.

Where do I go from here to eliminate it?

Thanks for any help.
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  #2  
Old 01-17-2009, 05:57 PM
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Join Date: Jan 2007
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Re: Help with runout

Yes, this has been discussed many times before, but I figure it will continue to be asked time and again until the big candle in the sky burns no more. So...I'll lend some suggestions.

You need to figure out where the runout is being induced. Is your chamber out of round? Case necks inconsistent (thickness ans concentricity)? Die misalignment in the press? Bad die? Inconsistent chamfer on the mouth? Bad seating die? Press out of alignment? Etc...?

There are plenty of ways runout can be induced, but until you measure (not visually, with an indicator) from one end of the process to the other, and between every step, you'll be hard pressed to find the culprit.
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  #3  
Old 01-17-2009, 07:49 PM
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Re: Help with runout

Check out this thread:

Bullet runout in 375 H&H - Topic Powered by eve community
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Derek M.
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  #4  
Old 01-18-2009, 11:47 AM
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Re: Help with runout

Thanks for that link.

I don't understand why it's not consistant from case to case. Some are bad. Some are near perfect then there are those in the middle.
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  #5  
Old 01-18-2009, 12:53 PM
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Re: Help with runout

Quote:
Originally Posted by buckbrush View Post
Thanks for that link.

I don't understand why it's not consistant from case to case. Some are bad. Some are near perfect then there are those in the middle.
Well, point one from your original post is that ALL rifles will shoot concentric ammo better than ammo with runout, not just yours.

In terms of continuity of runout, there are variables, some of which you can control, others you cannot. You can get a bad batch of brass.

I have found that cases from Winchester, Remington, and Hornady tend to have more runout from the factory when new, v. Lapua, Norma, and Federal. Once fired cases have less to no runout than new.

In the case of sizing, if your case mouths have even as little as a thousandth or half thousandth of asymmetry, this can cause more runout when you seat the bullet.

Do this: measure the OD of a loaded round at the neck. Compare that to a sized case neck when using the expander, and also a sized case without the use of the expander. Then measure the OD of a fired case.....all at the mid-neck.

What are all of those measurements? If it is greater than 8-10 thousandths, that is a big problem. My Redding 270 die had 17 thousandths difference from a fired case to a sized case without expanding the neck over the button. Simply put, that is overworking your cases.

Plus you really need to buy a Sinclair concentricity gauge. Straight ammo is the only way to go.
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  #6  
Old 01-19-2009, 02:08 PM
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Re: Help with runout

Neck size using Lee Collet Dies. Problem Solved.
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  #7  
Old 01-19-2009, 06:27 PM
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Re: Help with runout

Quote:
Originally Posted by buckbrush
I am using an RCBS rock chuck press with Remington Brass and a Lee Collet Die set.
Quote:
Originally Posted by 3006savage View Post
Neck size using Lee Collet Dies. Problem Solved.
Reading comprehension goes a long way. Problem unsolved.
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