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Thread: Very hard extraction.

  1. #1
    Member gadgetman's Avatar
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    Very hard extraction.

    OK, the girls rifle seems to shoot OK but there is a major extraction issue. The rounds are handloads with new Norma brass so shiny, clean and should not have any sizing issues. The loads are above ADI's max but show no signs of pressure. The bolt lift after firing is very easy but it takes several blows with the heel of my hand to move the bolt back. The necks once extracted look quite dirty. Very much like in this video.



    What suggestions do you guys have?
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  2. #2
    Member kidmac42's Avatar
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    I used to get that in my 308 with fiocchi factory rounds. I stopped using them and went back to corelokts.
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  3. #3
    P38
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    Back off a couple of grains in powder and try again.

    Cheers
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  4. #4
    Member gadgetman's Avatar
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    Previous owner had the same issue with factory or hand loaded ammo I believe.

    When I can walk I'll grab some of the brass and have a good look at it. There is a small gark on the neck of the brass and also on the wall of the brass by the neck. Both marks seem to line up.

    Work scrubbing out the chamber in the neck area?
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  5. #5
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    Rough chamber, must be a Remington it's the only company that would let that pass QA. Case forms over the rough ridge and gets stuck is my guess.

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    You mentioned in another thread that the handloads were loaded for another rifle, which I was taught was a no-no (unless they were very mild/starting loads). Add in that they are above max published load I would be very suspicious that they are too hot. You say no signs of pressure, but isn't sticky extraction a sign of pressure?
    I would make up some rounds with starting loads and see if you have the same issue with them.
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  7. #7
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    You could have a build of carbon around the neck area into the chamber. One way of clearing that is rotating a bronze brush in that area after having stacked the area with a carbon remover like Boretech c4 or some kroil oil.

    Maybe your chamber needs cleaning or polishing as well?

    But also start with less powder reloads and see what happens.
    You could also have Primery extraction issues with too big a gap between the bolt handle and rear of the action cam face. It pays to put a bit of grease on that area as well.
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  8. #8
    Member gadgetman's Avatar
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    Quote Originally Posted by Cigar View Post
    You mentioned in another thread that the handloads were loaded for another rifle, which I was taught was a no-no (unless they were very mild/starting loads). Add in that they are above max published load I would be very suspicious that they are too hot. You say no signs of pressure, but isn't sticky extraction a sign of pressure?
    I would make up some rounds with starting loads and see if you have the same issue with them.
    It is pretty much the standard handload recipe for 7mm RM on here and the only issue is the extraction. Bolt lift fine, primers fine and it does it with factory ammo too. My pick is not the load.
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  9. #9
    Terminator Products Kiwi Greg's Avatar
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    Quote Originally Posted by Friwi View Post
    Primary extraction issue
    This is the problem

  10. #10
    Member mikee's Avatar
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    I would suspect you may have no primary extraction. I have had 2 Remington both supplied brand new (and robbed for their a actions for custom builds)brand new with this exact same issue. One I had sorted and other has now been away a month being sorted after persevering with it for 3 years. Most accurate single shot I owned but if you missed then you were fucked
    See here,

  11. #11
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    Quote Originally Posted by kiwiazonic View Post
    Rough chamber, must be a Remington it's the only company that would let that pass QA. Case forms over the rough ridge and gets stuck is my guess.
    It's a Browning A-bolt and looking at the brass I can see a few marks that are the same on all the brass that has gone through this rifle.
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  12. #12
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    Quote Originally Posted by mikee View Post
    I would suspect you may have no primary extraction. I have had 2 Remington both supplied brand new (and robbed for their a actions for custom builds)brand new with this exact same issue. One I had sorted and other has now been away a month being sorted after persevering with it for 3 years. Most accurate single shot I owned but if you missed then you were fucked
    See here,
    Will check that out!
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  13. #13
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    Quote Originally Posted by gadgetman View Post
    Will check that out!
    Don't think it will apply if we are not talking about a remington but what you describe happening is something I have experienced repeatedly

  14. #14
    Member gadgetman's Avatar
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    Quote Originally Posted by mikee View Post
    Don't think it will apply if we are not talking about a remington but what you describe happening is something I have experienced repeatedly
    I suspect it is primary extraction.

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  15. #15
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    Hold on, the gun on the video was a right hand gun and this one is a left hand one? What is up with that inspector gadget?
    And you said it was a rem 700 problem in the title and yet you show us an a-bolt now?

 

 

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