[myhome]

I had loaded 25 rounds of this ammunition and fired this ammo in my S&W M&P15-22. 17 rounds had what looks as if excessive pressure upon firing pin strike enough to split the case, or separate the the head from the case or bulge the head of the primer area so as the empty case wobbles on a flat surface standing upright.
see the pictures
Ammo is Wincester Super X 1300 FPS
When each of these rounds fired smoke came out of the receiver and charging handle.
Need to know if this is common.

 

[W8LON]

Nothings changed I see. I have a brick of Winchester 22 mag JHP’s from the seventies that 95% of the cases crack and made knocking them out of the cylinder of my S&W 48 a chore. Ive tried them in a Marlin bolt rifle and the same. I guess $40 a brick was too much for them then and still is.

 

[Joe McNeill]

It is not a common occurrence and is dangerous, especially if your not wearing shooting glasses. S&W had a
problem with some of their bolts and had a recall which you could send your bolt in for repair/replacement. They
would also send out a gauge so you could check the bolt face to see if it was within specification.
I'm not ruling out the ammo but I would contact S&W for their comments/directions.

 

[JMynes]

Somebody has to say it.
Winchester rimfire ammo is junk.
Wear safety glasses. Try something made by CCI and report back.

 

[roysha]

Contact Winchester. If this is a common occurrence, Winchester is probably already aware of it and, at least in my experience with Winchester ammunition issues, Winchester will make it right with you. It may be a lot number issue or an entire run of faulty ammunition, but whatever it may be, Winchester NEEDS TO BE APPRIZED of the situation.

The situation is potentially dangerous to not only you, but anyone else that uses this ammunition.

EVERY company has produced "junk" so the blanket statement that "Winchester rimfire is junk" is nonsense. I have fired 10s of thousands of rounds of Winchester rimfire, and except for some miserable stuff made during the obomanation administration it has performed as good or better than anything else. From that era, with the exception of the high end target/match ammunition manufacturers, ALL the companies were putting out less than good quality ammunition.

 

[Litl_Red]

myhome, every one of the ruptures looks very much like the others. Are they also in the same place relative to the firing pin strike?

there might be more than the ammo contributing to those failures.

 

[armtx]

Winchester Rimfire, strikes again.

 

[shaune509]

May be just the way the photos are showing on my screen, But I'm seeing a rolled case mouth and rim forcing. Is the chamber correct or this lot of brass, long? Both would case a pressure spike.
Shaune509

 

[jlp4951]

yeah -what is up with that case mouth? chamber too short?

 

[Al the Infidel]

try something made by CCI and report back.

Worth repeating.

 

[Phil in Alabama]

All rimfire ammo has the case mouth crimped to retain the bullet. Those might possibly be crimped excessively, possibly a source of excess pressure??

 

[Ol` Joe]

I’m going with a rifle problem, not an ammo problem. The “crimp” I see on the case mouths should not be there and points to a short chamber IMO. is there th possibility of a ring of brass breaking off from a previous round and lodging in the front of the chamber?
Something is definitely constricting the case mouth.

 

[Litl_Red]

are they hard to chamber?
do the cases look the same when fired in a different gun?

 

[The Yeti]

S&W had a problem with some of their bolts and had a recall which you could send your bolt in for repair/replacement. They would also send out a gauge so you could check the bolt face to see if it was within specification.
I'm not ruling out the ammo but I would contact S&W for their comments/directions.

+1
Call S&W. Check headspace!