New CZ .17 Hornet Rifling failure - RimfireCentral.com Forums

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  #1  
Old 03-11-2018, 01:32 PM
251280hias

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New CZ .17 Hornet Rifling failure



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https://picload.org/view/dalrrroi/sc...24-01.png.htmlHi at all,

I have bought a new CZ 527 varmint in 17 hornet. During the initial cleaning bevor firing my first round i did notice a strange failure in the land and groove pattern. About 35mm (2 inch) from the muzzle crown down the barrel the rifling is not existing for about 2mm, it looks like a ring

I will send the rifle back for waranty.

So please excuse that it is not a rimfire, and i am probably being wrong in this forum, but 17 hmr is the same bore, so please let me know if i am the only person who dicovered such a failure. I asked google like mad and did also an extensive picture search etc... canīt find any information.

Pleasefind attached picture.
Quote:
[IMG]
[/IMG]
It is not a shadow, i can feel the fault with a toothpick slided over.


https://picload.org/view/dalrrroi/sc...24-01.png.html


Last edited by 251280hias; 03-11-2018 at 03:12 PM. Reason: Picture Link
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  #2  
Old 03-11-2018, 02:50 PM
GH41

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Quote:
Originally Posted by 251280hias View Post
Hi at all,

I have bought a new CZ 527 varmint in 17 hornet. During the initial cleaning bevor firing my first round i did notice a strange failure in the land and groove pattern. About 35mm (2 inch) from the muzzle crown down the barrel the rifling is not existing for about 2mm, it looks like a ring

I will send the rifle back for waranty.

So please excuse that it is not a rimfire, and i am probably being wrong in this forum, but 17 hmr is the same bore, so please let me know if i am the only person who dicovered such a failure. I asked google like mad and did also an extensive picture search etc... canīt find any information.

Pleasefind attached picture.

It is not a shadow, i can feel the fault with a toothpick slided over.

Picture links don't work for me.
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  #3  
Old 03-11-2018, 03:29 PM
minuteshaver

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crappy photo,however it looks like its been counterbored PORELY. I can see the regular barrel and rifling, then there is a thick step and then thin shallow rifling starts again. bizaare.

would love to see the barrel slugged from the muzzle
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  #4  
Old 03-12-2018, 08:01 AM
251280hias

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IT IS NOT A FAULT

So today i did get in touch with CZ. They told me that this groove in the rifling near the muzzle is intendet as accuracy enhancer, a special design for this Barrel (caliber 17 Hornet)

I told them, that it would be wise to write this in the Manual. (not shock others)

But first i was happy about that my gun is fine

The rifling after the groove area is fine, but my camera canīt focus both areas.
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  #5  
Old 04-04-2018, 09:11 PM
newbie2 is online now

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Please let us know how this rifle shoots. I am not totally on board with the interrupted rifling theory of accuracy. I would expect gasses to get past the bullet and cause upset.
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  #6  
Old 04-05-2018, 06:57 AM
GH41

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Originally Posted by newbie2 View Post
Please let us know how this rifle shoots. I am not totally on board with the interrupted rifling theory of accuracy. I would expect gasses to get past the bullet and cause upset.
Pease school me. I have never heard of "interrupted rifling theory of accuracy".
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  #7  
Old 04-05-2018, 09:54 PM
newbie2 is online now

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That is a tongue in cheek comment on CZ's answer that having a ring in the barrel 2 inches from the muzzle and claiming it is an accuracy enhancement.
I would liken to to a barrel that had a bullet stuck in the bore and another round was resulting in a ring in the barrel.
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  #8  
Old 04-16-2018, 09:08 PM
newbie2 is online now

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Is this thread dead?

I would like to find out the answer.

Did I scare another OP away. My wife told me to STOP IT !
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  #9  
Old 04-17-2018, 08:10 AM
GH41

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Originally Posted by newbie2 View Post
Is this thread dead?

I would like to find out the answer.

Did I scare another OP away. My wife told me to STOP IT !
Maybe he has a real job and hasn't found the time to shoot it.
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  #10  
Old 05-20-2018, 07:45 AM
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Al the Infidel
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Originally Posted by newbie2 View Post
Is this thread dead?

I would like to find out the answer.
Ditto!
Did I scare another OP away. My wife told me to STOP IT !
You're not that ugly are you?

bump
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The better you are... the more lucky you will be!
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  #11  
Old 05-20-2018, 12:22 PM
rth1959rth
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I don't buy the explanation at all. I would call CZ and ask to speak with the head gunsmith. I also would not shoot it until I was comfortable with the second opinion. If not, I would begin climbing further up the chain of command. Also, document who, what, when, etc. so you are 100% certain of your conversations.

Just what I would do. But, please keep us informed.
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Old 06-03-2018, 09:20 PM
newbie2 is online now

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One of the regular shooters at the club has a CZ 527 in 17 H. I will get a peeksee on his.
I am still not sure if the OP had shot the firearm.
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Old 06-21-2018, 05:15 AM
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I may have to look at my 17HH.
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  #14  
Old 07-14-2018, 01:32 AM
251280hias

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Hello,

My appoplgies i am late as hell with my reply! To all interested in how it shoots, i did my load testīs and found, this rifle is a graet shooter.

Loves the 25 grain berger Part number 17308, 0.0010 of the lands on VN 120 Powder, or RS Swiss RS36 Powder.If i can do my part it is consistent 10 shots within 2 centimeters at 100 Meter in indoor range from a rest.

Also the Nosler 20 grain Varmagedon Part Number 30531 on same powders.

To sammi specs OAL it shoots 5 cm groupes. I did alterthe magazine to acept the longer loaded cartriges.

I shoot this rifle a lot, because of the economical bullet price and the small powder consumption.

Our crows here on my farm are smart and they learned about my skill behind my Savage .22LR MK2 FV (;.

Now with good wind conditions i can shoot minute of crow out to 200 Meters reliable.

Wish all the best from Austria!
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Old 07-25-2018, 10:47 PM
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Actually not the report I expected, but I am glad for you. I have the sister in .22 Hornet. It is just a delight to haul around for wood chucks.
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