split necks in winchester brass

oldfamily

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Joined
Sep 26, 2005
Messages
349
Location
South Central Missouri
Has anyone had problems with split necks? I annealed 90 pieces of winchester brass hoping that would help, i am necking down to 257, and found several in last batch. All new brass.
 

Lefty7mmstw

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May 13, 2012
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4,942
Location
Dakota del norte
I haven't seen split necks in win 7stw brass shot as 7stw, but win hasn't made 7stw brass since '04 so some of it could be rather brittle.
I've got 200 win casings and shot all of them last year at least once, never loosing one. I have had a heck of a time with some twice necked 7rum brass I have though... the one batch must have not been annealed enough as I've lost 30 in a couple of firings...
 

CogburnR

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Joined
Dec 18, 2010
Messages
558
Location
SD
The last bag of 270WSM I opened had 12 unusable cases. Split necks and pressure fissures in the neck shoulder area.
 

FearNoWind

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Joined
Jul 10, 2012
Messages
2,323
Location
North Central Valley California
Are you turning you brass to even out the neck wall thickness? Uneven neck wall thickness contributes to split case necks because the thinnest portion of the case neck gets increasingly weaker from one reload to the next and eventually fails. Turning the necks to reduce the uneven wall thickness helps prevent that from happening.
 

oldfamily

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Joined
Sep 26, 2005
Messages
349
Location
South Central Missouri
Brass was split once it was loaded, of the ones that split chrushed and could tell that the force needed was greater than one that I annealed. These were from last batch of stw brass Winchester made so more than likely quality control was lacking to say the least.
 

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