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split cases

 
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  #1  
Old 03-08-2010, 09:35 PM
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Location: Idaho
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split cases

Any ideas on the problem we are having would be great
thompson encore in 300 win mag
Had a problem with the cases spliting off about a 1/2 in from the bottom
scratch our heads check stuff talked with thompson they looked at the barel said it had excesive head space and replaced it
we had scope problems got that worked out and started shooting again
and the case split off again check some more rounds and several had cracks in them. some shot cases shown slight signs of primers flatting out.
loading 71 gr 4831sc 190 gr bergers .005 from the lands.
the case splitting does this sound more like excesive head space or pressure problems.
second if the measurements on the loaded shell where off say .007 putting the bullet into the lands chould this cause pressure problems?
thanks
retiredcpo
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  #2  
Old 03-08-2010, 10:16 PM
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Re: split cases

your reciver could be flexing, check the length of the brass before and after it is fired
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  #3  
Old 03-08-2010, 10:23 PM
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Re: split cases

vintec
interesting idea never thought of something like that
maybee to much recoil for a break open gun?
its a buddies gun not mine btw
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  #4  
Old 03-08-2010, 10:31 PM
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Re: split cases

Let us know what the b4 & after measurements are.
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  #5  
Old 03-08-2010, 10:39 PM
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Location: Sonoma County, CA
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Re: split cases

The case splitting definately sounds like a headspace issue. It would be intersting to take a headspace measurement on the datum line of a new case and then compare it with a once fired. I had a Rem 700 that would stretch the shoulders .014 on fireforming but it was still able to get 5 or more reloads, depending on the brass. Good chance both these barrels were chambered with the same reamer.

The flattened primers sound more of a pressure problem. Maybe try backing the load down some or seating a little deeper. Or both.
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  #6  
Old 03-09-2010, 10:20 PM
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Re: split cases

Is this new ammunition or are they reloads? If they are reloads how many times has the brass been reloaded?

Steve
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  #7  
Old 03-09-2010, 10:37 PM
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Re: split cases

its all reloads with 4 or 5 loads on the cases
We have no idea what the before measurements are
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