Initial shot string data from the newly released Hatsan Bully 25 cal

Forums PCP Airguns Initial shot string data from the newly released Hatsan Bully 25 cal

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    Rich7777
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    Got the newly released Hatsan Bully 0.25cal from Dennis at IndianaAirguns.com. At the time, they didn’t have the Bully listed so I called him and he ordered it. Their website is a work in progress, but Dennis is a pleasure to deal with. I got the Hatsan Bully a few days later. Spent Thurs. and Fri. evenings cleaning the barrel and mounting a scope, On Sat., I went out to their airgun range for a day of shooting. I was able to get the sidewinder scope sighted in and ran different pellets over my chrono. At 250 bar, this thing is HOT. The shot curves are declining flat lines. I think a hammer spring tweak will settle it down into a nice shot curve. I’m looking forward to playing with it.

    200+ shots later, here’s the data:   

    Pellet  –  JSB Match Diabolo Exact King  25.39gr
    Shot Count  –  39 (3 full mags)
    HI  –  1115
    LOW  –  811
    AVG  –  991
    ES  –  304
    SD  –  89.9

    Pellet  –  JSB Diabolo Exact King Heavy 33.95gr
    Shot Count  –  39 (3 full mags)
    HI  –  1017
    LOW  –  702
    AVG  –  897
    ES  –  315
    SD  –  97

    Pellet  –  JSB Diabolo Exact King Heavy 33.95gr
    Shot Count  –  39 (3 full mags)
    HI  –  1016
    LOW  –  713
    AVG  –  899
    ES  –  303
    SD  –  88.6

    Pellet  –  Eun Jin Pointed 43.2gr
    Shot Count  –  39 (3 full mags)
    HI  –  938
    LOW  –  640
    AVG  –  826
    ES  –  298
    SD  –  91.48

    Pellet  –  H&N Baracuda Green 19.91gr
    Shot Count  –  39 (3 full mags)
    HI  –  1171
    LOW  –  781
    AVG  –  1017
    ES  –  390
    SD  –  116.28

    There’s a lot to like about this bullpup. More to come.

     

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    Rich7777
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    Let’s see if I can get a graph to post
     

    Download 1524447379_5055098875add389329da59.21505826_Hatsan_Bully_25cal_1st_shot_strings_graph.png

    EDIT: That’s a bit hard to see so I attached the photo.
     

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    Glem.Chally
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    Looks like power to spare,  looking forward to seeing it after some tinkering.  Nice work Rich!

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    Seth0764
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    Great info. Thank you for taking the time to post. I am interested in this one.  Can you tell me the SD and ES for the first magazine?  
     

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    Rich7777
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    “Glem.Chally”Looks like power to spare,  looking forward to seeing it after some tinkering.  Nice work Rich!


    Thanks! 
    It has some power. That first shot on the Eun Jin was 84.4 FPE. I’m going to push slugs through it next and see what that looks like. 

    Now to order springs.

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    Rich7777
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    “Seth0764”Great info. Thank you for taking the time to post. I am interested in this one.  Can you tell me the SD and ES for the first magazine?  

     


    I think I’ve got this calculated right. Based on first 13 shots for each shot string. Not sure what’s going on with the heavy’s. Shot 2 strings of them. Might be on my end or just a new gun settling in.

    Pellet – ES – SD
    JSB Match Diabolo Exact King  25.39gr – 66 – 19.8
    JSB Diabolo Exact King Heavy 33.95gr – 44 – 11
    JSB Diabolo Exact King Heavy 33.95gr – 59 – 16
    Eun Jin Pointed 43.2gr – 44 – 11.6
    H&N Baracuda Green 19.91gr – 73 – 22.3

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    Rich7777
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    Still playing with the data. Here’s the average FPE per shot string per mag

    String 1 – Mag 1 – JSB Match Diabolo Exact King  25.39gr – Avg FPE = 66.7
    String 1 – Mag 2 – JSB Match Diabolo Exact King  25.39gr – Avg FPE = 56.5
    String 1 – Mag 3 – JSB Match Diabolo Exact King  25.39gr – Avg FPE = 44.2

    String 2 – Mag 1 – JSB Diabolo Exact King Heavy 33.95gr – Avg FPE = 75.3
    String 2 – Mag 2 – JSB Diabolo Exact King Heavy 33.95gr – Avg FPE = 62.9
    String 2 – Mag 3 – JSB Diabolo Exact King Heavy 33.95gr – Avg FPE = 46.1

    String 3 – Mag 1 – JSB Diabolo Exact King Heavy 33.95gr – Avg FPE = 74.4
    String 3 – Mag 2 – JSB Diabolo Exact King Heavy 33.95gr – Avg FPE = 62.5
    String 3 – Mag 3 – JSB Diabolo Exact King Heavy 33.95gr – Avg FPE = 47.7

    String 4 – Mag 1 – Eun Jin Pointed 43.2gr – Avg FPE = 81.6
    String 4 – Mag 2 – Eun Jin Pointed 43.2gr – Avg FPE = 67.8
    String 4 – Mag 3 – Eun Jin Pointed 43.2gr – Avg FPE = 49.4

    String 5 – Mag 1 – H&N Baracuda Green 19.91gr – Avg FPE = 57.3
    String 5 – Mag 2 – H&N Baracuda Green 19.91gr – Avg FPE = 47.5
    String 5 – Mag 3 – H&N Baracuda Green 19.91gr – Avg FPE = 34.2

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    E-Dogg
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    I have this gun as well. Don’t have a chrony yet and new to tuning trying to learn. What would be a first adjustment with this data?

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    Rich7777
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    Before I do anything, I’m going to see how bullets perform. Once I’m done getting baseline data, I’ll start working on the hammer spring until I get the desired velocity for the pellet I want to tune for. Backing the speed down should create more of a shot curve than a flat line. This should improve accuracy a lot. At this point, it’s shooting way to hot for pellets. I’ll start with the hammer spring, then possibly adjust the valve spring. 

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    E-Dogg
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    Stayin tuned!

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