Case head separation with Win T22


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jr_roosa
May 15, 2012, 08:54 PM
Not reloading per-se, but I thought reloaders would be more interested in this than elsewhere on the site.

I was practicing before last night's bullseye match with my high standard using Winchester T22 ammo, which feeds great, but has terrible priming and overall QC. I've actually shot 100s in timed and rapid with this stuff, but it misfires so much I only use it for practice ammo now.

Anyway, I got a blast of junk in my face, a funny report, and found the bottom of the case pinched between the bolt and barrel. The next round was fully in battery and ready to go. Somehow I found the rest of the case on the ground amongst the tons of .22 brass.

I think the bullet went to the 8 ring at 3:00, but this might have been a previous shot (25yd Timed/Rapid target). The rest were in the black, and all 10 rounds were on the target.

Here are some pix:

http://farm6.staticflickr.com/5323/7206334692_5a85fe2fe2.jpg (http://www.flickr.com/photos/67652701@N03/7206334692/)
Untitled (http://www.flickr.com/photos/67652701@N03/7206334692/) by jr_roosa (http://www.flickr.com/people/67652701@N03/), on Flickr
http://farm9.staticflickr.com/8017/7206333918_8f87edd58f.jpg (http://www.flickr.com/photos/67652701@N03/7206333918/)
Untitled (http://www.flickr.com/photos/67652701@N03/7206333918/) by jr_roosa (http://www.flickr.com/people/67652701@N03/), on Flickr
http://farm8.staticflickr.com/7242/7206333004_fc7d6053dd.jpg (http://www.flickr.com/photos/67652701@N03/7206333004/)
Untitled (http://www.flickr.com/photos/67652701@N03/7206333004/) by jr_roosa (http://www.flickr.com/people/67652701@N03/), on Flickr

The other guys at the match suggested that I loaded it too hot, or that I need to have the headspace on my high standard checked. :)

The last comment might not be too far from the truth...maybe it's time for a new recoil spring.

-J.

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MutinousDoug
May 16, 2012, 12:37 AM
I've never seen this in a .22 rimfire round but it doesn't look to me as if it is a headspace or out of battery issue. (I could very well be mistaken.)
I would expect to see swelling ahead of the rim in ether of those events.
Curious. I suspect a defect in the ammunition.

Blue68f100
May 16, 2012, 10:25 AM
I've seen some blow off just above the rim but not where that went, strange. Could have just been a bad case, hard to tell. I only use Fed ammo when it comes to Rim fire.

gamestalker
May 16, 2012, 04:55 PM
Other than constant mis fires with factory 22LR ammo, the only serious event was with a bolt action rifle, it was with factory ammo that I suspect had a double charged cartridge. The case blew apart and my bolt blew out through the back of reciever. This happened in like 1970 and the particular rifle was a rather old and poorly designed firearm. In all manner of speaking, that bolt gun had, had a KB. It ruined the rifle.
GS

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