Hatsan Bully 25

Forums PCP Airguns Hatsan Bully 25

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    Jorgo
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    Need some advice at barrel port.

    I take out the bullys barrel to see how big tje barrel port is.

    The caliper shows 0.181

    I want to shoot pellets and slugs

    Can i make it bigger? Is my question or longer to 0.200 or 0.195.

    The pellet probe  has 0.137 i think it will be stable at .0100.

    I have instal a Altaros regulator.

    Altaros send me on that i can adjust to 170 bars.

    Actually it is on 150 bars and shot the jsb 25 gr at 950 fps and the 34gr at 850 fps at lightest hammer spring set.

    Like bevor at that pressure without reg

    Have no fps drop with the reg it seems like the plenum in the gun is large enough.

    Tomorrow i install the scope and make some string test.

    Gun look with the reg not bad

    It just fills now realy slow.

     

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    Seth0764
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    Very cool! I'm interested in the shot string.

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    Bigragu
    Participant
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    Yeah, me, to Jorgo. Show us the shot string! 

     

    Thank you you for posting your results so far.

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    Jorgo
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    So for first i must correct somthing.

    I dont like glasses but maybe i think about it

    The reg pressure was not 150 bar it was 145 or 140 like on the image

    First test was with jsb kings..filling the gun to 3350 Psi

    Here the results in meter/second

    At this speed tje kings dont perform well

    960/970 fps are to fast out my rifle for them

    From shot 35 comes the drop

    I have cast some slugs with a mp.mold and shot just for fun a few

    I know they need a higher pressure not just 145 bar

    Dont perform good at 750 fps

    Next one was JSB Heavy 34gr

    Becouse the light a have much errors at the chrony i will try it another time to make a full string

    Here are a few shots with them

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    Seth0764
    Participant
    Member

    Those are some nice shot strings.  Where did you get the regulator? 

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    Jorgo
    Participant
    Member

    Hello Seth, i order the Regulator from Altaros 

    It can be set till 170 bars.

    Just the filling times are longer with this bottelregulator 

    But it makes a good Job

     

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    Jorgo
    Participant
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    This rifle have a real big plenum

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    Jorgo
    Participant
    Member

    The tube with the valve have 34 ml inner plenum…without the block

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    Jorgo
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    Cant take down the valve from the tube with two people ..who knows how they put it on the tube mabe with some maschine

     

    i want to block the.lower holes and.line up the valve with the tp port…bit cant do it now

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    Jorgo
    Participant
    Member

    ..

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    Jorgo
    Participant
    Member

    Orginal Barrelport was 0.177 

    I enlarge it to 0.190 ..maybe go step furter to 0.20.

    Transferportsize was  around 0.23 inch

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    Jorgo
    Participant
    Member

    Pelletprobe original  0.138 sized down to 0.10 inch

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    Jorgo
    Participant
    Member

    Velocity and power test

    With Jsb 25gr and 34 no changes at 250 bar with full hammer strike.

    With the cast slugs 48 grains velocity

    Before portwork and probeworke was 820 fps…after 903 fps or 11 fpe

    Sttrange that with tje pellets i have no changes at max power just gaining more speed at lower psi but it reaches a maximum and more pressure dont give more speed.

    With the heavier slugs this little porting give me 80 fps.more speed very stabel from 250 till 300 bar after it drops

     

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