Cooper 92 6.5-284 gaining accuracy

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by smoked, Nov 22, 2017.

  1. nd_rice

    nd_rice Member

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    I had to send my rifle in also, I haven't even fired it yet. I started getting corrosion on on the top of the bolt and after I would dry fire it the bolt lift was very stiff. When I talked to Cooper and told them about the corrosion they said they were aware of it and had changed the finishing process. They said it was a fairly common issue. Then I told them about the very stiff almost difficult to open bolt and they said that is a less common issue and then they sent me a UPS call tag. I sent if off a couple days before Christmas and I don't have it back yet.
     
  2. shphtr

    shphtr Well-Known Member

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    Sounds like my 6.5 x 284 Cooper. I am just now prepping brass but the bolt is VERY HARD to lift after dry fire - ? normal. Have you gotten your rifle back yet? What did Cooper say? I really want to start shooting in stead of sending to Cooper!
     
  3. ovastafford

    ovastafford Well-Known Member

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    Maybe I haven’t paid a lot of attention but this is the first time I’ve heard a lot of problems about their rifles. Is their quality control slipping?
     
  4. smoked

    smoked Well-Known Member

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    Well Andrew from Cooper wants to take a look at it. So far very professional and eager to help. We will see what happens when it gets inspected.
     
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  5. SnakeRiverEric

    SnakeRiverEric Well-Known Member

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    I have not sent it in yet as I want to hunt some hogs first. They said 6-8 weeks.
     
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  6. SnakeRiverEric

    SnakeRiverEric Well-Known Member

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    Don't think so, but I will check again. The fluted bolt is what hits the 2nd round in the magazine, the first or top round goes into chamber fine. You can see the fluted bolt ridges on the neck and shoulder of the 2nd round in the magazine. Sounded like they knew what was wrong and have a new bolt design.
     
  7. Greyfox

    Greyfox Well-Known Member

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    May not be the issue, but it is the symptom of the magazine problem I described. The bullet gets cocked in the magazine. It’s easy to check out.
     
  8. SnakeRiverEric

    SnakeRiverEric Well-Known Member

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    IMG_6837.JPG IMG_6844.JPG
    Here are some pictures of the problem I am having with the denting of the brass. Happens to the 2nd bullet in the magazine, after the top one is taken to the chamber.
    You can see the fluted bolt ridges in the brass. The bottom plate does move forward very easily too and could cause issues as well.
     
    smoked likes this.
  9. yawn

    yawn Well-Known Member

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    Iv just picked up a cooper M92, the underside of the bolt has been machined flat where it rides over the rounds in the magazine.
     
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  10. joep17

    joep17 Well-Known Member

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    As a big fan of 6.5-284 and a big fan of coopers ( I have 5 ), I thought I would log in an give my once a year opinion. Firstly, I find all their barrels to be accurate but lower velocities and pressure signs before I near max loads. All can shoot 5 shot 100 yard groups under 0.75" with a load it likes.

    I was fortunate with my 6.5-284 Cooper Phoenix to quickly find a load with 142 gr SMK and R22 that would repeat groups 0.3 to 0.4" when I kept the bullets seated 15 thousandths off the lands. I did not notice but I hope you are using Lapua brass. I have over 1500 rounds through the barrel and no degradation in accuracy....yet...but I know it is coming.

    Where I will switch my direction is your comment on using Berger. I shoot F Class and just put my 5th barrel on my 308. I have found Berger bullets extremely accurate once you test the "bullet jump" for your barrel. I have had barrels that like 5 thou and some that like 30 thou. All cut with the same reamer on Kriegers. My opinion is to experiment with jump once you have measured OAL to lands with a great tool like Sinclair. My tool is 20 years old but I am sure you can still get one.

    I hope you get yours to shoot well. Copper makes an outstanding product and stands behind them.

    Your shooting friend from Canada.
     
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  11. joep17

    joep17 Well-Known Member

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    Edit.
    I forgot I have a Colt/Cooper also so that makes 6....please don't tell my wife:)
     
    Sykes likes this.
  12. ovastafford

    ovastafford Well-Known Member

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    I should have my 92 by the end of the week curious to see if mine has the same milling under the bolt.
     
  13. Sykes

    Sykes Well-Known Member LRH Team Member

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    I had to go check mine out, Both of my 92s have the bolt machined flat
     
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  14. nd_rice

    nd_rice Member

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    When did you send your rifle in? I still haven't gotten mine I'll give him a call this week out of curiosity.