BT65 Carnivore .357 tune results, how did I do?

Forums PCP Airguns BT65 Carnivore .357 tune results, how did I do?

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    TheLakeRat
    Participant
    Member

    Ok folks, I’ll pretty new to the air gun world so I’m a bit ignorant to some of this stuff. But due the wealth of info from the wise members oh this and another forum I think my learning curve has been pretty steep.

    Anyway I bought a used bt65 off of the classifieds board for a buddy and he wanted me to get as much out of it as I could with the ability to shoot a full mag on a nice bell curve.

    So after much reading, I decided to jump in head first.
    Here is a list of mods
    I made a longer bolt the hammer spring adjustment and ran it down till it would cock and then backed out off 1 turn.
    I put brass screws in all the ports of the valve and then drilled a new hole in line with the transfer port.
    I drilled the transfer port and barrel out to about .260 (don’t remember the exact measurement)
    I turned the valve rod down to .131
    I drilled the seat hole out to about .280?

    And here is a 6 shot string

    Shot. Bar. Fps. Ft/lbs
    1. 200. 846. 128.8
    2. 191. 878. 138.7
    3. 184. 875
    4. 177. 860
    5. 170. 856
    6. 162. 840
    156

    So my question is, should I stop there? It seems to me I still have a lot of air left. But from what I’ve read I think that’s about all I can get out of it?

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    ajshoots
    Participant
    Member

    Maybe Bwalton will chime in as he is the Hatsan guru, but the string looks pretty good to me. We’re you using 81gr JSB pellets?

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    JDShapp
    Participant
    Member

    Glad to see the gun is turning out good. Those are good numbers from what I remember reading on other forums.

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    TheLakeRat
    Participant
    Member

    Yes AJ 81gr JSB.

    JD, thanks again. My buddy is a happy guy.

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