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Joined: Apr 2010
Posts: 20
New Member
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OP
New Member
Joined: Apr 2010
Posts: 20 |
My cousin has a Charles Daly 7mm Rem Mag (Mauser Action). He was firing factory Winchester 150 grain loads (grey box). He noticed two fired cartridges had developed cracks in the case body. I'm not sure what caused this and my cousin lives some distance away so I'm just going on what he told me. Could it be defective factory ammo? or maybe oversized chamber? I suggested that he measure his fired and unfired cartridges with a micrometer, and to clean and inspect the chamber to see if that can shed any light on the problem. Does anyone have any ideas before going to a gunsmith. We had shot the rifle previously (it was brand new) without any issues. The round count is probably less than 150 rounds. Thanks Ed
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Joined: Feb 2009
Posts: 11,920
Campfire Outfitter
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Campfire Outfitter
Joined: Feb 2009
Posts: 11,920 |
If the chamber is clean and has no marks like that in it,I would have to say the brass is the problem. I had some winchester brass for a pistol that cracked when loading and out of the ones that didn't some did when shot. you might run this by the factory and see what they say.
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Joined: Aug 2009
Posts: 2,794
Campfire Regular
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Campfire Regular
Joined: Aug 2009
Posts: 2,794 |
A fellow in another thread got a Remington case w/o a primer hole. He sent a picture to Remington and they are sending him 200 new cases. I wouldn't be surprised if Winchester would do the same.
Aim for the exit hole.
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Joined: May 2005
Posts: 16,554
Campfire Ranger
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Campfire Ranger
Joined: May 2005
Posts: 16,554 |
I should think Winchester would be very interested in seeing the cases, remaining ammo, and the lot number.
The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh
Which explains a lot.
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Joined: Feb 2002
Posts: 7,203 Likes: 1
Campfire Tracker
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Campfire Tracker
Joined: Feb 2002
Posts: 7,203 Likes: 1 |
It is a stress crack. I have been shooting Rem 7 Mags since 1977, never seen anything like this. Two things would cause this: Extremely hard brass Oversize chamber firing work hardened brass Brass defect-thin wall If you have the devise from www.sinclairintl.com that measures wall thickness, you could determine wall thickness at any point in the case.
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Joined: Jan 2001
Posts: 29,944 Likes: 10
Campfire Ranger
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Campfire Ranger
Joined: Jan 2001
Posts: 29,944 Likes: 10 |
If you have two cracked cartridges, why not cut one lengthwise down through the crack and do your own assessment? Save the second for Winchester.
1Minute
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Joined: Apr 2010
Posts: 20
New Member
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OP
New Member
Joined: Apr 2010
Posts: 20 |
Good idea, I'll get ahold of my cousin to advise him.
tks
Ed
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