New Benchrest Gun Finished Just a day setting up now

Discussion in 'Benchrest' started by Graham freeman, Feb 28, 2018.

  1. bobt

    bobt New Member

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    Must admit I am still confused. Are you saying that a bad crown can be corrected with an air stripper or am I missing something.
     
  2. hmangphilly

    hmangphilly Floppy Quick Phil

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    A. Bad crown cannot be corrected with an airstripper .
    The op was saying he saw no need to create a crown ( recess ) in the muzzle in order to protect the pellet exit from accidental damage .
    The fitment of his muzzle device would shield the end of the barrel .
     
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  3. Waldo

    Waldo Active Member

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    I was talking to a gun smith (makes F class rifles ) he said one of the reason for an accurate crown is so that the pulse of air or gas that pushes the projectile out of the barrel is uniform . If a barrel has a poorly cut crown the pulse will deflect the projectile .

    So as long as the muzzle is cut accurately and fitted with a stripper /mod then you don't need a crown ?.
    Then why would manufactures supply rifles with crowned barrels and a stripper as standard ie Steyr. ?
     
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  4. hmangphilly

    hmangphilly Floppy Quick Phil

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    Possibly

    To give you the option of not using the stripper.

    And / or

    Simply that people these days expect a barrel to be crowned .

    In practical terms , If you're setting a machine up to cut the end flat and true it not much extra effort to put a recognised crown on .

    It's the flat and true part that takes the effort

    Some makers do it better than others . I've found Steyr s usually jolly good.

    The famous s200 cz barrels often pretty pants .
    And don't even get me started about those other 'cz 'things
     
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  5. Waldo

    Waldo Active Member

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    Thanks Phil, I've been reading through various post on American BR sites ,it appears the jury is out on the necessity of a crown , one quote was " a perfect crown does nothing ,it's the imperfections in poor crowns that cause the problems ".
    One chap took a grinder ! to a barrel and completely buchered the muzzle ,then shot 5 shot groups at 100 yds, there was some effect on accuracy but not what you would expect! .

    Most hunting rifles have recessed crowns where as the target jobs have flat muzzles with no crown .
    So the reference to crown damage is obviously more relavant to the hunting side of things .

    I promise not to mention .cz things :)
     
    Last edited: Mar 3, 2019
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  6. Waldo

    Waldo Active Member

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    The crowns on the rifles I use are 11 degree target crowns , after a session the residue that acumalates on the muzzle face is uniform with no clear strips ,so these crowns seem to be cut accurately.

    I suppose ,thinking about it ! if the barrel is cut accurately with no burrs etc ,it's the same as having an accurately cut crown ?.
    And of coarse better than a shabby crown .
     
    Last edited: Mar 4, 2019
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  7. bobt

    bobt New Member

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    Any more updates Graham ?
    Interested in outdoor performance i.e. what's it like in the wind.
     
  8. Tiger

    Tiger Member

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    So which one is it?
     
  9. Fly fisher

    Fly fisher New Member

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    What a lovely piece of kit. Best of luck with it.
     

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