17HMR bullets opinions

[41magjh]

I bought two bricks along with two17HMR rifles ones never been shot the other has between 450 to 500 round . The other day it blew up so I got to looking at the rifle an bullets. After looking at the cases I saw the necks were cracked. Started sorting them out I had 32good ones 14 spit ones one blow up three shot .Got 8 more boxes some you can see that there is split necks in them. I have had them for several years in my gun safe . Defect or age look for opinions

[35remington]

I'm afraid your post is not well composed.

Your rifle blew up? Or not? "blow up three shot." What does that mean?

The only thing I got for sure is that you have some split necks. This happens sometimes with some lots of 17 HMR. The cases were not annealed properly.

[jhalcott]

I and a buddy have shot thousands of 17HMR in T/Cs and bolt rifles. I've never seen split necks on the ones we've shot. What gun did you "blow up"? We can't seem to keep the ammo around longer than a couple weeks. I've seen age cracks on old military surplus ammo. Is this what you are seeing?

[41magjh]

Yes rifle blew up. I was try try to explain the 50 rounds in the box . But 14 isn't that a bit much out of 50

[jonas302]

what brand of rifle? Do you have any pics?

[Bullshop Junior]

How do you blow up a 17 HMR?

[41magjh]

The rifle is a marlin pic will not show damage. The brass is still in chamber . 35remington yes you correct I'm not good at explaining things. I'm seeking knowledge as to why so many case necks are split

[Bullshop Junior]

Did the case blow out inside the chamber? How is the gun damaged?

[41magjh]

Bullshop Junior
The only conclusion I could come up with is the bullet got pushed back into the case. Then when I fired the rifle there a spike in pressure bullet was stuck in rifling

[41magjh]

Yes it blew up in chamber pressure came out threw the magazine clip an pressure vent I assume. I do know one thing for sure I'm not shooting it again ever

[Bullshop Junior]

I would contact Marlin and the manufacture of the ammo. I've never heard of a rimfire blowing up before.

[uscra112]

Did the rim blow out? That's the usual mode when a rimfire "blows up".

The .17 HMR is pretty high pressure to begin with, for a rimfire. Some people have said too high for a rimfire case. IMHO they are right, so I don't have one, much as it would be useful around here.

A too-sharp firing pin could make the rim split. Damaged rim, maybe? Flawed brass, maybe? Bore obstruction maybe? Pictures would help a lot.

Rim blowouts used to happen quite often in the bad old days when .22 cases were copper, and cheap revolvers did not have recesses in the chambers for the rims.

[41magjh]

I thinking it all happen due to the split neck on the case so check an check again even though it's factory in any caliber

[Bullshop Junior]

The necks were split before firing..?

[41magjh]

I will try to put pic on here

[41magjh]

Hope this helps. You can see the split neck on the top one well. The black piece is the rim the rest is in chamber. That the bullet I knocked back out with cleaning rod

[Bullshop Junior]

Is that hornady ammo?

[jblee10]

It looks like the remains of the base of a cartridge in your pic. And I can't see splits in the neck of the unfired ammo. Pics don't tell the whole story. But I would say you have a problem of an unsupported chamber. Not headspace, because the round still fires. But a chamber problem. Probably a short barrel shank. Send that rifle back before you visit the eye doc.

[41magjh]

Didn't notice it till after the fact open box loaded shot three of them the fourth blew. I didn't expect that they would have split necks. Now I know better . How many time have people grabbed a box dumped some in hand load then shoot . I would expect it more in the larger calibers to have the split necks

[HKMAN3344]

It sounds like a out of battery ignition.
Even with escaping gas from the split case I would think the chamber would give enough support to push the bullet out of the barrel. If the case was not supported because it was out of battery that would explain the projectile not making it out of the barrel.
I have had 17 Mach 2 blow up in my face more than once. Every time it was in a T/C R55 Sporter. I also got a hold of some Aguilla 22's that were double primed. They blew the rim completely off and left a hollow tube of brass in the chamber.

[jonas302]

Your ammo is junk throw it away and move on it has nothing to do with the rifle they are already cracking in the box bad brass or storage you could send a pic to hornady with the lot #s

I doubt your rifle is blown up take it to a smith to get the stuck case out and inspection

[41magjh]

Thanks for ya'll for replying.I did talk to a tech an he said that it could be case harding over time that could cause the splits so I will have to take his word for it. Thanks again for replying.