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Case separation ??

 
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  #1  
Old 11-22-2011, 09:35 PM
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Case separation ??

All of a sudden I'm getting case separations. Shooting a 7mag, new Hart barrel, 162 A-max, 72grs H-1000, MV 2970. Only 230 rds down the tube. Had been loading using my old Lee dies with no problems and now I've switched to Redding S type. Brass had been Win, and Nosler. Several cases separated after 4 loading. The separation in about 1/16" above the belt. These have been full length re-sized. One of the guys at Hart says that my dies are not set up correctly. Needless to say Redding is close for the week. Any suggestion guys.
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  #2  
Old 11-22-2011, 09:42 PM
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Join Date: Jun 2009
Location: Merkel, Texas
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Re: Case separation ??

Quote:
Originally Posted by sendero72 View Post
All of a sudden I'm getting case separations. Shooting a 7mag, new Hart barrel, 162 A-max, 72grs H-1000, MV 2970. Only 230 rds down the tube. Had been loading using my old Lee dies with no problems and now I've switched to Redding S type. Brass had been Win, and Nosler. Several cases separated after 4 loading. The separation in about 1/16" above the belt. These have been full length re-sized. One of the guys at Hart says that my dies are not set up correctly. Needless to say Redding is close for the week. Any suggestion guys.

Howdy,

Here is an excellent article on how to set up your dies. Hope this helps.

Coach

The Rifleman's Journal: Basics: Headspace
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  #3  
Old 11-22-2011, 09:51 PM
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Re: Case separation ??

Set up your dies to push the shoulder back .001" or less. Essentially, ignore the belt. The article that Coach linked to is spot on. One minor detail that is easily missed in that article is "consistent application of sizing lube is important." I use Imperial sizing wax, I apply it with my fingers and have not found a more consistent lube, when you're reloading for accuracy.

AJ
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  #4  
Old 11-22-2011, 10:16 PM
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Join Date: Dec 2010
Location: Central Ohio
Posts: 133
Re: Case separation ??

Yes, ignore the belt and headspace off the shoulder but that doesn't mean you won't get head separations. Also, just neck sizing the brass should help. You apparently got 3 loadings out of the brass and with some loads and some rifles that's all you're going to get.
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  #5  
Old 11-22-2011, 10:30 PM
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Join Date: Mar 2010
Location: Eastern Washington
Posts: 205
Re: Case separation ??

I agree with the above posts I have ran into the exact same thing. I have found it only take 2-3 times of reloading the cases with the shoulders pushed back to far before they start seperating especially after running that much powder. I do have a question for you, what is the length of your barrel? The reason I ask is because I run 70.4 grains of H1000 behind the 162 amax's and in a 24" barrel I am getting 3040 fps and in my 28" barrel and the exact same load I am getting 3133 fps. Good luck with your problem I set my dies to just sqeeze everything more that resize it.

Jason
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  #6  
Old 11-22-2011, 11:07 PM
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Re: Case separation ??

The barrel is 26" with a 9 twist.
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  #7  
Old 11-23-2011, 08:00 AM
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Re: Case separation ??

Quote:
Originally Posted by sendero72 View Post
The barrel is 26" with a 9 twist.
You should also change out the standard expander if you haven't done so already.
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