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Thread: AT44 Power Adjustment

  1. #1

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    Default AT44 Power Adjustment

    Guys, I need some help here.

    Being new to the whole PCP thing, I reckon you'll help a lot in the future as well.

    Here goes,

    I received my long awaited Hatsan AT44 yesterday, unpacked everything, assembled everything etc.

    Logically, I started trying out different brands of pellets to see which ones she likes most, and found some interesting results as one can only imagine. Group sizes were quite acceptable though, as this rifle will not really be used for any target work, more for PC.

    I would like to know if anyone can tell me if the AT44 has a power adjustment screw, if so, where is it located etc. If not, how do I go along adjusting the muzzle velocity? I read about guys adjusting the MV by setting the force of the hammer spring, how is this all done, where to start, how much to adjust at a time etc.

    I really need all the advice and tips I can get, as I'm really new to all this.

    My main reason for wanting to adjust the MV, is the muzzle crack, the rifle is fine accuracy wise, but delivers one HELL of a bark. Sounds identical to .22LR.

    Funny enough, with this (I assume) very high MV, the rifle is still grouping fairly well, and gives me about 50 shots from 190 - 110 bar. Penetrates a 38mm SA Pine like butter.

    I thought that if were to lower the MV somewhat, the muzzle crack would be less, and I will also get more shots per fill, not that I'm unhappy with current state of things.

    I guess the other alternative is to leave everything as is, and fit a silencer.

    Please bear in mind that I don't have access to a chronograph.

    Any advice is very welcome.

  2. #2

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    I have the same rifle and with a silencer all you hear is the pellat hitting your target, it really makes a huge difference, I would also like to follow thisthread and see what all can be done with this rifle in regards to tune-ability,

    Hey Atcta what pellatsdid you find the rifle prefered I have only put a few shit nortica pellats through mine

  3. #3

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    Quote Originally Posted by Sick Boy View Post
    I have the same rifle and with a silencer all you hear is the pellat hitting your target
    How do some of you guys get that right? I always hear that quote. I've tried how many silencers but even at only 650 fps I can clearly hear the shot go off...

    Can that only work with specific rifles? It seems impossible but as I always hear that sentence than it must be the truth.

  4. #4

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    I don't know the Hatsans, but can't you play with the strength of the striker spring?

  5. #5

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    dude for realy all i hear is the spring as I pull the trigger, it actually can become irratating cause it sounds like a lil childs toy gun whahah

  6. #6
    JTK's Avatar
    JTK is offline Sharp Shooter
    SAFTAA FT Colours '10

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    Ettiene, the shot you hear is the hammer striking the valve. You cannot get rid of that mecahnical noise. Even with a very small silincer my 400 is dead quiet.

  7. #7

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    I shot an AT44 about six months ago, without any tuning and a silencer fitted, all I could hear was the hammer falling...

    I think mine's velocity is maybe set a bit high, 8gr pellets go supersonic, that's 1120fps or more, which I deem way too fast for .177

    Thus my question, how do I set the velocity on this beast?

  8. #8

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    I cronied my stock standard out the box with JSB heavies and it got 1125fps it's crazy

  9. #9

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    Change the striker spring.

  10. #10

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    Guido I believe had some springs made for his at the time and it worked good at taming the power, and the accuracy also improved. The correct tentioned spring is the way to go.

  11. #11

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    Yes. I have them now for my blizzard.

  12. #12
    Sniperdad's Avatar
    Sniperdad is offline Sharp Shooter
    Protea FT Team '09/'10
    National FT Champ '10

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    Theobens power is also not so easy to adjust, they have 2 springs, an inner and outer. To get the .22 down from 40fpe tp 30 fpe we remove the inner spring. But then it still needs to be finetuned to the exact speed, its 930 ft/s with 16 grainers. That we achieve by cutting the mainspring little by little. Dont know if the info will help.

  13. #13

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    Anything helps, keep them coming!

  14. #14
    JTK's Avatar
    JTK is offline Sharp Shooter
    SAFTAA FT Colours '10

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    get hold of JacoWP. he tunes them. Maybe he is willing to share some tips.

  15. #15

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    I know about JacoWP.

    I'm just somewhat afraid that he will tell me to send him the rifle for a tune, which I can't, if I spend R1 more on rifles within the next six months, the wife will shoot me for sure!

    I don't want anyone's family secrets, I just want to know how to tame the power a bit...

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