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I've seen it with both of the HMRs I've owned. Not often, but it happens. I remember reading a fair bit about this a few years back, but since it hasn't seemed to have an effect on the accuracy, or ability to extract the empty shell casing, I don't give it much thought.

HMRs are necked-down .22 magnums casings, and based on where these split, I'm guessing that the stress on that paper-thin brass (where it changes direction) might be too much sometimes. That's my understanding of this phenomena anyway.

As an aside, and it might just look that way in the photos...but those empties look kind of dirty. If so, I wonder if the fit of those bullets in the chamber might not be spot-on. (ie, too much room/gas blowing back/room for the casing to expand, etc.) 100% speculation and again...it could just look that way from the photos. The ones I shoot in my CZ come-out as clean as they went in. I know...cuz' I save/display them.

Can't throw away shiny gold things... :)
 
Aww, hell...now you can't reload them...


Is this for all the ammo you shoot? i'd say it could eb a combination of a chamber a tiny bit long or oversized. This is just helping you see which rounds are a little hotter :)
 
Over on rimfire central there is a bunch of talk about it, apparently some manufacturers stopped annealing cases to save a few bucks.

Thats what causes it.
 
The problem is that the cases have the priming compound put in them before the neck is sized into them. Obviously they can't anneal after sizing with the priming material in the case. As a result they are more brittle than an annealed case. All HMR is made by CCI despite the name on the box, so you can't avoid the ammo as it is all made the same.

In a tight chamber it tends not to split, but if it is only a thou or two larger the case will split. Savage know very well about the problem, and will probably replace the gun, but the new gun may do the same thing.

CCI's response is that it is not a safety issue, does not affect accuracy, and you can't reload them, so don't worry about it!
 
Had them sometime in my Savage 93R17. Strangely, never got one in both my CZ's, so maybe it has something to do with chamber size.

It never bothered me tho.
 
17 HMR cae problems

Remington was getting case split problems with their 597 semi-auto in 17 HMR a while ago. The did a recall and issued a $250 compensation certificate for the rifles.

They had some rifles returned, but those rifles today are worth more than $250 to people who want one, and it doesn't seem to be a concern to the people who own and use these Remington 597s today.

There have also been some split case problems with Ruger 10-22 rifles that people have converted to the .17 HM2 cartridge.
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I haven't had the problem in my Cooper. Federal,Hornady, and CCI cases weigh exactly the same, and are all loaded by CCI, so they likely come from the same source. Winchester cases are about 2.5 grains heavier, so there is something different about the Winchester case. I am using the Winchester loads exclusively, since they are more accurate in my rifle.
 
I get this with both cz 452s I shoot. Still getting ittybitty groups regardless. If CCI is making all the ammo, why do different brands, such as Hornady, Rem. ect shoot differently? Do CCI use different powders ect?

stretch
 
buffdog said:
They had some rifles returned, but those rifles today are worth more than $250 to people who want one, and it doesn't seem to be a concern to the people who own and use these Remington 597s today.
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I have two...Had three but it had a loose chamber with case splitting, so it was returned to Rem who replaced it with the 22mag version. The two I have work great. Had them looked at by a smith whio said these were safe to use.
 
I had this with Remington ammo a couple years ago in a m77 hmr, and some also split to the end of the neck. The smith at Corlane's said chamber was good and was a bad batch of ammo, Remington wasn't interested in doing anything about it.
 
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