New Benchrest Gun Finished Just a day setting up now

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

  1. Adam

    Adam Well-Known Member

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    Very interesting, do you know what the twist rate is on the "air polygon"?
     
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  2. Xdriver

    Xdriver New Member

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    Looks very nice, what are the weaver t36 scopes like ?
     
  3. bobt

    bobt New Member

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    Where did you get the barrel please.
     
  4. Graham freeman

    Graham freeman Member

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    YES WEAVER T36 SO GOOD
     
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  5. Graham freeman

    Graham freeman Member

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  6. bobt

    bobt New Member

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    Thanks for the info. I am thinking of tying one on a Steyr. I can machine my own so that's one good thing.
     
  7. Graham freeman

    Graham freeman Member

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    one bit of info no crown just straight cut you can skim the outer edge but don't crown or it will shoot like a shot gun
     
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  8. bobt

    bobt New Member

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    Wow glad you said that I would have crowned it. Thanks looking forward to trying one.
     
  9. Adam

    Adam Well-Known Member

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    Why? No expert but I thought a true crown was a prerequisite to accuracy.
     
  10. Graham freeman

    Graham freeman Member

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    a crown on a gun is to protect the end of the rifling where the pellet exits but on my gun it has a air striper so crown not required as the end of the gun is protected by the striper
     
  11. Adam

    Adam Well-Known Member

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    It’s primarily to ensure the projectile leaves contact with the rifling at precisely the same point all round the edge of the muzzle. You said don’t crown or it will shoot like a shotgun. I was wondering how/why that would happen, assuming the crown was properly done.
     
  12. Graham freeman

    Graham freeman Member

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    its a polygon barrel and because I have an air striper there was no need to crown the end to have it done it will cost £50 if I was not going to use a air striper I would pay the £50 but its up to you
     
  13. hmangphilly

    hmangphilly Can't Re Member

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    I'm
    Confused

    Will crowning ruin the accuracy ( shoot like a shotgun )

    Did you try or did someone else ?
    Or is your no crown policy because forbyour purposes it it not nrcesssary
     
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  14. Graham freeman

    Graham freeman Member

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    no crowning will not ruin the accuracy just why spend £50 if your going to use a air striper as long as the end is cut correctly with out bures it well not affect accuracy
     
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  15. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    Little point crowning a BR barrel especially if you're sticking either a tuner or stripper on it, though my preference would be for a tuner...;)
    These are great tuners:

    s: 403_image.jpg
     
  16. Waldo

    Waldo Active Member

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    Just got one of those for my Anschutz 54 ,if you've fitted one of these what method did you use to tune the barrell?
     
  17. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    As with all of these mods you just have to start at zero, shoot a couple of groups (with a warmed up barrel), then wind it to the middle, shoot more, then wind to the end etc.
    Decide which section seemed the most promising and then fine-tune from there comparing with a best group with no tuner.

    There is no easy route and what might be a one-holer for a particular batch of ammo might be a shotgun for another batch of the same ammo, so if you find something that works buy plenty of the same batch.
     
  18. Waldo

    Waldo Active Member

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    Thanks for the reply, I initially tried Tony Purdys PRX method and tuned to the 9th harmonic but that put the tuner outer tube way over the inner tube .
    I e- mailed Tony Purdy and found out that the PRX system does not work as well on 26 inch barrels! .
    I would have to fit weight rings and turn the tuner towards it's middle settings

    I was hoping to avoid having to use large amounts of ammo , oh well ! looks like that's the only option :)

    Sorry ,I know this is not air rifle territory, just thought I would just ask :)
     
  19. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    No problem, unfortunately there is no magic 'tuning fork' method, you have to shoot the lead, so it might take you a few sessions to really nail down the sweet spot of a particular node.
    Also bear in mind that for a particular batch the nodes might be closer or further apart, so try and find the extent of the next node and note down the difference as the barrel might perform better. Keep notes on everything...;)
     
  20. Waldo

    Waldo Active Member

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    Thanks again , nothing's ever simple !
     

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