peened case heads 30-06... Garand the culpret ??? - Page 2

Orlando · September 20, 2014, 05:02 PM

It extractor isnt damaged and bolt is clean trimming a coil off the spring is all you can do to try and prevent rim damage.
Its a cheap part to experimant with. Trimming the ejector spring wont help with the dented rim

Bart B. · September 20, 2014, 05:09 PM

Here are other things one can do to minimize case rim peening.

Use USA MILSPEC cases that are hard enough to minimize the problem. I often had well peened over case rims with soft Federal brass shot in Garands. As did people shooting Federal brass in M14's.

Smoothing up the extractor helps a lot; less friction sliding over the case rim.

Smear a little heavy grease on it.

Orlando · September 20, 2014, 06:03 PM

Its LC brass not commercial.

Magnum Wheel Man · September 22, 2014, 05:40 AM

LC-63 brass

jrothWA · September 26, 2014, 08:57 PM

you might have a plug of grease inside the extractor plunger and spring and not allowing it spring to flex as it encounters the case head.

James K · September 27, 2014, 10:44 PM

The extractor dents the case rims when it can't move enough to snap over the rim. Which means either that the extractor or bolt is defective or (more likely) that there is dirt in the hole where the extractor spring and plunger fit, not allowing the extractor to pivot freely. Clean that area first, and if the problem doesn't go away, then look for other possible problems.

If those case heads show flattening, the usual cause is high pressure*; I have seen many cases with the headstamp nearly obliterated and the case head actually expanded due to pressure, with an expanded primer pocket.

*I saw one instance of this condition due to soft brass; the shooter reloaded and decided to anneal his cases by heating them red hot and just letting them air cool. Not a good idea.

Jim

September 20, 2014, 05:09 PM	#27
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	Here are other things one can do to minimize case rim peening. Use USA MILSPEC cases that are hard enough to minimize the problem. I often had well peened over case rims with soft Federal brass shot in Garands. As did people shooting Federal brass in M14's. Smoothing up the extractor helps a lot; less friction sliding over the case rim. Smear a little heavy grease on it. Last edited by Bart B.; September 20, 2014 at 05:24 PM.

September 22, 2014, 05:40 AM	#29
Magnum Wheel Man Senior Member Join Date: July 26, 2006 Location: Southern Minnesota Posts: 9,333	LC-63 brass __________________ In life you either make dust or eat dust...

September 26, 2014, 08:57 PM	#30
jrothWA Senior Member Join Date: November 11, 2006 Posts: 2,519	Detail the bolt... you might have a plug of grease inside the extractor plunger and spring and not allowing it spring to flex as it encounters the case head.

September 20, 2014, 05:02 PM	#26
Orlando Senior Member Join Date: May 2, 2009 Posts: 352	It extractor isnt damaged and bolt is clean trimming a coil off the spring is all you can do to try and prevent rim damage. Its a cheap part to experimant with. Trimming the ejector spring wont help with the dented rim

September 20, 2014, 06:03 PM	#28
Orlando Senior Member Join Date: May 2, 2009 Posts: 352	Its LC brass not commercial.

September 27, 2014, 10:44 PM	#31
James K Member In Memoriam Join Date: March 17, 1999 Posts: 24,383	The extractor dents the case rims when it can't move enough to snap over the rim. Which means either that the extractor or bolt is defective or (more likely) that there is dirt in the hole where the extractor spring and plunger fit, not allowing the extractor to pivot freely. Clean that area first, and if the problem doesn't go away, then look for other possible problems. If those case heads show flattening, the usual cause is high pressure; I have seen many cases with the headstamp nearly obliterated and the case head actually expanded due to pressure, with an expanded primer pocket. I saw one instance of this condition due to soft brass; the shooter reloaded and decided to anneal his cases by heating them red hot and just letting them air cool. Not a good idea. Jim