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Old 02-26-2017, 08:10 AM
mattusmc

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22 WMR split brass cases?



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Guys,
I picked up a Ruger American 22 WMR carbine yesterday at the local gun show. Got it used.
While sighting it in with Winchester Super X 40 grain hollow points I experienced 4 split brass cases. I had to use my knife to pry them out of the chamber.
Anyone else have this happen? I see a few threads on 17 HMR but none on 22 WMR. I am thinking of trying some different ammo. Please post any info you guys have
Thanks Matt

Last edited by mattusmc; 02-26-2017 at 08:13 AM.
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  #2  
Old 02-26-2017, 08:50 AM
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If it is older Super-X then the cases are to blame. I have an old box that I took out this week to use in my Contender. Most of the 20 rounds I shot had split cases. I remember this happening with my WMR rifle and Super-X in past years with this same lot. Hopefully the newer stuff is better. How old is your Super-X box?

https://www.google.com/search?q=22+w...utf-8&oe=utf-8
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Old 02-26-2017, 09:01 AM
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Brass as it ages can become brittle and crack. I loaded some .223 that is 25 years old for my AR. Shot some out of my bolt action varmint rifle last year and the cases cracked so bad some of the necks seperated. The 17 rimfires do this because they are not anealed after forming.

When I have cases cracking I always try different ammo first.
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  #4  
Old 02-26-2017, 01:43 PM
mattusmc

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Yes it was older stuff a buddy gave me. Gray boxes with orangish writing. 40 grain jacketed hollow points.
I tried resighting in with new Federal 30 grain hollow points and had no issues at all in 25 rounds. I am pretty sure that first ammo was the issue.


Last edited by mattusmc; 02-26-2017 at 02:26 PM.
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Old 03-04-2017, 07:57 PM
john the plinker
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I had the same thing happen with Winchester ammo also, only it was with fairly new ammo. Accuracy was horrible also. Tried several types of ammo and had no problems.
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Old 03-05-2017, 08:26 AM
mattusmc

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I have it sighted in with Federal now and the issue has not returned. I also found a bunch of CCI 40 grain JHPs for sale so I picked them up. That will probably end up being for go to round.
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Old 03-07-2017, 11:52 AM
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Same experience with the Winchester 40 gr JHP in a CZ455.

Ammo has been returned to Winchester quality control dept.
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Old 03-07-2017, 08:33 PM
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measure....

measure some of the fired cases that did not crack for expansion by the rim. Or measure your rifle's chamber diameter if you have the tools.
Just to eliminate the possibility of an oversize chamber.
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