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Thread: Brno 601 what now

  1. #1
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    Brno 601 what now

    Ive been playing arround with a brno 601 243 i got on the cheap a week or so ago its got the typical last few inches near the muzzle of pitting that you see in old hunting rifles but looks pretty good in the 1st 20 inches of the 23.5 inch barrel
    I have played with a few Different bullets and the groups are inconsistent
    A load exactly the same will shoot just under an inch about 0.8 or so @100
    But the very next group will be 1.5-2 inch
    I noticed a bad crack in the stock Name:  AAEF89F0-164D-494A-9C93-41F2FE9CA630.jpeg
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    which I thought might be flexing and Causing bedding issues
    So I took it round to a mates that’s a wood guy and fixed it
    Now solid as I went to the range and re tested
    No change in group sizes

    So im wondering what to try next I grabbed a mint or very close to mint stainless barrel off a browning
    I have pet Machinists that are capable if fitting that if needed but im trying to avoid a rebarrel

    Im wondering about trimming it to 20 inches
    This will get rid of the pitting in the barrel leaving behind a pretty nice tube
    Which would probably improve the accuracy??

    Any other ideas??

    Name:  BEA64E6A-61B6-41E8-A097-8C6B7D668257.jpeg
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    4 groups same load
    As you can see each group has pretty clear flyer some worse than others
    Typically 2 shots land pretty close then a flyer opens up the group

    I have Several pages of targets with Different projectiles
    All are the same one good group followed by shit then another gooden

    Ive seen barrels far worse than this shoot much better

  2. #2
    Member rossi.45's Avatar
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    recrown and try again . . . R
    without a picture . .. it never happened !

  3. #3
    Member norsk's Avatar
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    Leave it alone and just go hunting.
    It's accurate enough for 99% of hunting situations.
    Chop the barrel and recrown if you want.
    "Sixty percent of the time,it works every time"

  4. #4
    Member 300_BLK's Avatar
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    Quote Originally Posted by norsk View Post
    Leave it alone and just go hunting.
    It's accurate enough for 99% of hunting situations.
    Chop the barrel and recrown if you want.
    Plus 1
    Warm Barrels!

  5. #5
    Member Marty Henry's Avatar
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    Our expectations of accuracy have gone up significantly over time. Our grandparents great grandparents depending your age would have been happy with 4 moa or less in a hunting rifle. Now we moan about anything over 1 shot off a bench under ideal circumstances.
    Crowning will likely give a significant improvement it did on a 7x57 sporterised Spanish mauser I used to own that had a decidedly below par barrel.
    tetawa, Moa Hunter and mimms2 like this.

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  7. #7
    Member Tahr's Avatar
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    I would take the bull by the horns and trim it to 20" to get rid of the pitting, and you would get a recrown at the same time in any event. 2 birds with one stone.

    The .243 in 20" performs pretty damned well.

    The pursuit of accuracy is often more satisfying than leaving it as a "good enough for hunting" rifle. In your situation I can fully understand that.

    Cigar's idea of a re-bed sounds useful too - and it would be a bit of fun and a new adventure.
    Moa Hunter and mimms2 like this.

  8. #8
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    Another thing to check on an older rifle is the mainspring (firing pin spring) as old springs can get soft and cause inconsistent ignition which will give fliers. Happens occasionally on a new rifle too when the spring "binds" on the firing pin or inside of the bolt body . . . . I had one just recently where clipping one coil off the mainspring has reduced fliers to nil, the spring had a bulge and was touching inside.
    Moa Hunter and csmiffy like this.

  9. #9
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    I would give it a good clean, make sure the action and bottom metal are correctly mated and check for wear spots where metal on metal and address anything too proud or bed anything

    also it may have historic copper deposits in its barrel. I plugged and left mine to soak while cleaning with JBs bore paste

    you can counterbore your barrel the four inches that has excessive wear or pitting to maintain the look and foresite (I did this first in my days before suppressors) then shortened it a few years later

    check the twist rate too, if you are on the edge of stabilising a too heavy proj Iv seen the inconsistency you are talking about
    A flat base 80gr soft point would be my pick

    Im on my second 18inch 243 and its my main rifle so dont be shy to trim the barrel, velocity loss is minor (100fps) and a shortened brno 601 is as good a bush gun as they come

    look for spots in the stock where it has warped and may be either touching the barrel or twisting on the action. If its getting wet/dry and things are changing give them a little bit of clearance and some boiled linseed oil

    dont rule out anything basic like loose rings or a scope in the process of failing too or a creepy trigger

  10. #10
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    Quote Originally Posted by Tentman View Post
    Another thing to check on an older rifle is the mainspring (firing pin spring) as old springs can get soft and cause inconsistent ignition which will give fliers. Happens occasionally on a new rifle too when the spring "binds" on the firing pin or inside of the bolt body . . . . I had one just recently where clipping one coil off the mainspring has reduced fliers to nil, the spring had a bulge and was touching inside.
    this happened to my brno too
    the firieing pin had gunk in it and had mushroomed off too much and wasnt setting off harder primers
    Moa Hunter likes this.

  11. #11
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    My 601 243 had a pressure pad at the front of the foreend, but the stock must also have warped over the years as it was pressing in the side of the barrel too. Sanding off the side contact helped. Bedding then floating the barrel made a significant improvement.
    Moa Hunter and mimms2 like this.

  12. #12
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    Wow so meny great suggestions this is why I love this forum
    I could leave it as is it certainly shoots good enough but it nags me when I know it should or can do better if it was stuffed id be quite happy but it’s not and it should shoot better than it does currently
    Which is why ive decided to go Further

    I think there’s a big Argument for cutting the barrel to get rid of the pitting and will have the added advantage of a new crown and suppressor thread so I will do that

    Ill glass bed the rifle aswell ive done a couple before and I get compond for free so it’s worth doing

    Then ill see about doing the trigger as it’s pretty shit tbh
    Tahr and veitnamcam like this.

  13. #13
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    Quote Originally Posted by rambo-6mmrem View Post
    Wow so meny great suggestions this is why I love this forum
    I could leave it as is it certainly shoots good enough but it nags me when I know it should or can do better if it was stuffed id be quite happy but it’s not and it should shoot better than it does currently
    Which is why ive decided to go Further

    I think there’s a big Argument for cutting the barrel to get rid of the pitting and will have the added advantage of a new crown and suppressor thread so I will do that

    Ill glass bed the rifle aswell ive done a couple before and I get compond for free so it’s worth doing

    Then ill see about doing the trigger as it’s pretty shit tbh
    The trigger is adjustable for pull, do you have the standard or set trigger?

  14. #14
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    @Cigar standard I think
    I read your reply to my pm btw
    Id already taken the bull by the horns and took it apart ready for the bedding job hahaha
    Don’t think it will be to bad to put back together
    Put all the bits in bagies labled where they go
    And took plenty of photos
    I’ll grab some compound tomorrow and get it done

  15. #15
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    Standard trigger is curved, set trigger is straight. Both can be used like a standard trigger and are adjustable for pull weight, and the lightness of the set trigger when used as a set trigger can also be adjusted.
    I can send you a scanned copy of the manual if you like - assuming you get it all back together of course!

 

 

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