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Author Topic: advice needed: case head separation  (Read 3263 times)

Offline yorketransport

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Re: advice needed: case head separation
« Reply #15 on: September 10, 2017, 08:34:49 PM »
This sounds like the perfect application for Plastigage!

Offline Oh Mah

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Re: advice needed: case head separation
« Reply #16 on: September 10, 2017, 08:40:38 PM »
very nice.did you have same problem with shorter o.a.l?

Yes.  The case head separation actually happened when I was seated about .050 off the lands.  But I don't think seating depth is playing a role here.  My understanding is it's a function of repeated expansion and resizing cycles with a chamber that is set up beyond spec, coupled with resizing the brass back 0.008 each time.

It sounds like I need to take the rifle back to the smith and have him verify that the chamber is set for proper headspace.
yes i agree with having it verified,Reason i ask is if it shoots as well as you describe seems to be a very well built rifle.A loose chamber most likely will not hold 1/2 moa.Have you tried farther out like factory around .150 from lands and see how well that magnum shoots and if it still causes the separation?
"Boss of the woods"
(this is in reference to the biggie not me).

 


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