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Old 07-21-2020, 12:19 AM
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Headspace question



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I may have missed this on older posts, but I see variable bulges on cases from the same box of ammo. To be clear I see the base “pouched” out on several fired cases of a magazine.
Is this a result of headspace issues?
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Old 07-21-2020, 02:41 AM
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Quote:
Originally Posted by ericbc72 View Post
I may have missed this on older posts, but I see variable bulges on cases from the same box of ammo. To be clear I see the base “pouched” out on several fired cases of a magazine.
Is this a result of headspace issues?
Not exactly sure what you mean by "pouched" out on the base. Could you explain a bit more in detail or better yet post a pic of a fired piece of brass with the base pouched out, as you're calling it.

Excess headspace generally results in split necks or a fired piece of brass will have the shoulder pushed forward and the neck will be shorter, but in rimfires with boltneck cases it's generally split necks.

An over sized chamber can result in the case wall splitting or a piece of brass that has a slight bulge in the sidewall and is hard to extract.

If the case head itself is deforming or blowing out, generally, it's caused by high pressure. Or, if the cartridge isn't completely inside the chamber and when it goes off the unsupported part of the brass will blowout.

Have you ever noticed that sometimes the bolt is a lot harder to close on a loaded round?
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Old 08-16-2020, 12:02 PM
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Quote:
Originally Posted by ericbc72 View Post
I may have missed this on older posts, but I see variable bulges on cases from the same box of ammo. To be clear I see the base “pouched” out on several fired cases of a magazine.
Is this a result of headspace issues?
The spent cases out of my Ruger 77/17 always have a slight dome on the case head after firing. I always assumed this was simply pressure working against the case head and possible due to bolt machining. It has shown on all brands and loads. Only had a couple split necks over the past few years, with more than 3000 rounds through this rifle so far, so it has not concerned me.
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Old 08-18-2020, 08:54 PM
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Here is a pic of both American Eagle and Win headstamped cases I shot today out of my 77/17. Both show a dome on the head. Never had an issue with it.



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Old 08-19-2020, 07:33 AM
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I'd email a note to Ruger with your significant doming pix and see what they say about it Ragged.
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Old 08-20-2020, 02:19 AM
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I'd email a note to Ruger with your significant doming pix and see what they say about it Ragged.
Yeah on that!
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Old 08-20-2020, 12:54 PM
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Originally Posted by Al the Infidel View Post
I'd email a note to Ruger with your significant doming pix and see what they say about it Ragged.
Triple that!

The doming is the step right before separation and not good. Especially at WSM pressures.

OP, what firearm are you shooting?
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Old 08-21-2020, 10:01 AM
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I'd email a note to Ruger with your significant doming pix and see what they say about it Ragged.

After 3000+ rounds and never any issues, I’ll just keep shooting it. Don’t fix what ain’t broken


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Old 08-21-2020, 10:17 AM
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The fired cases from my VQ semi-automatic .17 WSM looked like this, sooty but flat as can be with no doming whatsoever:


Ditto on the fired cases from my now-departed 1885 .17 WSM; flat as can be:


I could live with slight doming on a .17 WSM semi-auto, since the .17 WSM cases are considerably stouter than any other rimfire, but a locked-breech rifle should not exhibit doming.

Good luck!

TBR
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  #10  
Old 08-23-2020, 06:52 AM
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Shims for 2 piece Ruger WSM bolt

Shively Sales Jackson MI sells shims that fit between the 2 piece Ruger bolt which will improve head space. They also sell a trigger sear and spring which reduced the trigger pull from about 6 # down to 3 # . I glass bedded the action and free floated the barrel . The parts from Shively Sales and improving the bedding has decreased my 100 Yd shot groups .
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Old 08-29-2020, 07:29 AM
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Shively Sales

Go to Shively Sales to get instruction to install their parts.
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Old 08-30-2020, 09:34 AM
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One can imagine the kaboom of a 17WSM is significant when she blows!
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Old 10-26-2020, 11:51 AM
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Thats likely cartridge headspace variance along with thinner/thicker cups.
Nothing to worry about IMO.
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Old 10-26-2020, 02:02 PM
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I have a Volquartsen 17 WSM and also a Savage B-Mag and have put over 2,000 rounds through them and never experienced any domed brass. My empty brass looks like what TBR has pictured. I have experienced domed brass with my 17 hmrs though with no issues.

Wonderdog1
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Old 10-26-2020, 02:31 PM
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Savage B-Mag and have put over 2,000 rounds through them and never experienced any domed brass. My empty brass looks like what TBR has pictured. I have experienced domed brass with my 17 hmrs though with no issues.

Wonderdog1
Same experiences here although less rds thru my B.Mag and ditto the doming of my 17HMR cases from my Rem 597 semi.
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