What could cause this?

Discussion in 'Advanced Gunsmithing & Engineering' started by Elite Precision, May 14, 2019.

  1. Elite Precision

    Elite Precision

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    i did not see any bulge in the previously fired cases. just the scratch line as mentioned in the above update. when you say overdone feed ramp, are you referring to the ramp on the action, or the chamfer on the chamber entry of the barrel? and what could i do to check for this and repair? thanks for your input.

    matt
     
  2. Elite Precision

    Elite Precision

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    this would be proven by using go/nogo gauges correct?
     
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  3. 243winxb

    243winxb

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    Looks like you found the problem.

    Yes, the gauges help. If a rifle will chamber a field gauge, it should be inspected and repaired.

    The imprint in the bolt face is high pressure for sure.
     
    Last edited: May 15, 2019
  4. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    Excessive bolt nose clearance is my guess. It cannot physically blow out that far forward with proper support. Use plastigage or lead solder to check those clearances
     
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  5. Elite Precision

    Elite Precision

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    i agree. but, if it were in excess, wouldn't it blow out on the first or second shot fired? why would there be a problem on round 24?
     
  6. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    Wasnt the first box factory ammo? Then a few reloads then boom? Weak piece of brass with a strong overload. Either way it cant blow out there unless the chamber isnt right- proof loads dont
     
  7. 243winxb

    243winxb

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    243WinFactoryAmmo.jpg This>
    High pressure welded the brass into the bolt face of this Rem 700.
    Shooting factory new Winchester 55gr ballistic silvertips, this model Rem 700 locked up the bolt. A gunsmith had to remove the barrel to get the bolt open. The brass is welded to the bolt face. http://www.thehighroad.org/showthread.php?t=579068 See post #20 photos

    Edit/add- Weld-
     
    Last edited: May 16, 2019
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  8. Elite Precision

    Elite Precision

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    the first box was factory hornady match ammo, then the next 4 were factory nosler trophy grade ammo. the 4the being the one that blew. nothing was handloaded.
     
  9. Bill K

    Bill K Silver $$ Contributor

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    But a overdone feed ramp, would still be far behind a closed bolt into the lugs and the round in the chamber, while the shooter aimed, pulled the trigger and the bullet hits the target where he was shooting.
     
  10. Bill K

    Bill K Silver $$ Contributor

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    Probably your best action, with this info now posted, is to talk to and probably let Nosler and their experts look and check out your rifle and the remaining rounds of ammunition you have.
     
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  11. gunsandgunsmithing

    gunsandgunsmithing The best tuners and wind flags on the market Gold $$ Contributor

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    I think he's referring to the chamfer at the back of the chamber.

    What make and model gun is this...Remington 700?

    If so, there is nominally .150 of unsupported case on those, which is more than most and about as much as I'm comfortable with having as the solid portion of most rifle brass is roughly the same. Add in a heavy chamfer at the rear of the chamber and it can cause problems, particularly so on a hot or over pressure round.
     
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  12. Elite Precision

    Elite Precision

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    thanks for your input.... and yes its a rem 700
     
  13. paperpuncher

    paperpuncher Silver $$ Contributor

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    Measure bolt nose clearance. Can you provide pics of the chamber end with and without a case inserted.
     
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  14. wyop

    wyop

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    1. I'd be looking for what's causing that line on the cases where the above case failed. Is there a burr on the edge of the chamber?
    2. You didn't mention what sort of action this happened in. That might be useful.
     
  15. dskogman

    dskogman Silver $$ Contributor

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    Too much unsupported case as stated above. This one was the 10th round and was an X. Shooter almost lost an eye.
    EC36FBFA-FCED-42D8-BA8E-5D0F8188DA04.jpeg
     
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  16. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    Look at the other picture above- the case welded itself into the boltface and still didnt blow out into the magazine
     
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  17. Elite Precision

    Elite Precision

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    it was a Rem 700 . thanks for the input.
     
  18. Elite Precision

    Elite Precision

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    i will try when i get back to the shop. thanks for your input.
     
  19. wwbrown

    wwbrown Silver $$ Contributor

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    What I find surprising is "bullet went on target at correct aim." I would have thought the trajectory of the 4th round would have differed from the first 3 given the loss of gas that blew the bottom metal and other things out.
     
  20. shortgrass

    shortgrass

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    Buy the way the case looks in that first pic, there's way too much cartridge case hangin' out of that chamber, unsupported.
     

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