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Combro help.............

Discussion in 'Anything Airgun Related' started by Bwarnos, Feb 17, 2012.

  1. Bwarnos

    Bwarnos Busy Member

    Messages:
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    Location:
    Woodbridge
    I bought a combro CB-625 off Ruben, great guy. I have just been in the Garden and fired 90 shots through it but need some help understanding things!!!

    I put the correct pellet weight in (the right place i think) and reset it after each shot.

    Below are the readings....maybe boring for some!!!

    190 Bar

    10.58
    10.64
    10.63
    10.64
    10.73
    10.66
    10.67
    10.98
    10.72
    10.81

    180 Bar ish

    10.73
    10.91
    10.83
    10.87
    11
    10.86
    10.94
    10.69
    11.05
    11.02

    170 Bar ish

    11.08
    11.02
    10.99
    10.97
    11.03
    11.08
    11.09
    11.08
    11

    160 Bar ish

    11
    11.16
    11.19
    11.27
    11.13
    11.29
    11.21
    11.32
    11.24
    11.30

    150 Bar ish

    11.19
    11.28
    11.29
    11.32
    11.35
    11.17
    11.28
    11.27
    11.25
    11.21

    140 Bar ish

    11.30
    11.30
    11.30
    11.32
    11.30
    11.13
    11.30
    11.28
    11.36
    11.38

    130 Bar ish

    11.36
    11.28
    11.41
    11.33
    11.40
    11.36
    11.28
    11.43
    11.33
    11.35

    120 Bar ish

    11.40
    11.33
    11.38
    11.33
    11.27
    11.36
    11.41
    11.28
    11.35
    11.28

    110/115 Bar ish

    11.30
    11.33
    11.17
    11.13
    11.13
    11.13
    11.03
    11.08
    10.92


    So!!............. Have I just wasted 90 pellets and done this wrong!!!?

    My questions are what would now be the best pressure to fill my gun to so I can get the most out of it. First time using such a thing so havent really got a clue what im doing!!!!

    When I hold the PDS button down it shows 11.03 so is that my average? Seem's a bit low?

    Cheers Guy's!
     
  2. Irvysan

    Irvysan Posting Addict

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    Location:
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  3. Bwarnos

    Bwarnos Busy Member

    Messages:
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    Location:
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    Yea got the manual thanks Irvysan, came with it, just not that good at understanding it!!
     
  4. gasman

    gasman Up a bit,,,,,,,

    Messages:
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    Location:
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    CHRIST ,nodded off then :yawn:
     
  5. Bwarnos

    Bwarnos Busy Member

    Messages:
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    Location:
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    :moo: any ideas then fella!!!? Just want to know if this looks like I have done it right!
     
  6. gasman

    gasman Up a bit,,,,,,,

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    done what right,put me to sleep,yep you sure have :up:

    no only pulling you plonker,i'rrrrrrrm yer look ok,looks to me like your fill pressure needs tobe no higher then 180 max
     
  7. Bwarnos

    Bwarnos Busy Member

    Messages:
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    Location:
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    Troll's don't sleep! :Rock On:

    I was thinking 160 Bar would give me 50 good shots?
     
  8. Bwarnos

    Bwarnos Busy Member

    Messages:
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    Location:
    Woodbridge
    After having another look through my results I am wondering if they are a bit too varied!? Lowest at 10.58 and highest at 11.43 should it not sit around the same level roughly? :confused:

    Any help would be great!


    .
     
  9. DougR

    DougR Busy Member

    Messages:
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    Location:
    Deepest Darkest Wales
    Any unregulated gun is going to exhibit a "power curve" - that is the average power (muzzle velocity) will change depending on the pressure in the main reservoir...

    Look like your gun is doing exactly that.
    Overfilled to 190 bar you are down to ten and a half FtLbs
    in the "Sweet spot" - 135 down to 110 you are seeing around 11.3
    then it starts to tail off gently.

    All in all it looks like a pretty decent performance.

    If you want to get picky, record the speeds rather than the power, and put the figures into Excel - and then start playing with the statistical toolkit.


    Standard Deviation has nothing to do with sexual preferences.
     
  10. Darren Petts

    Darren Petts Temporarily Alive

    Messages:
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    640
    Location:
    Wakefield
    I'd agree that converting that to fps would be more valuable to look at. Looks like a 170 bar fill is ideal.
     
  11. Bwarnos

    Bwarnos Busy Member

    Messages:
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    Location:
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    Cheers for the comments Dough and Darren, I never use more than 30 shots in a shooting session, sometimes not even 10 depends what's about so 150 bar for hunting and 170 for plinking I rekon!


    .
     
  12. darklord

    darklord Can’t beat a tx200 at 30m

    Messages:
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    394
    Location:
    NEWBURY
    looks right to me a pcp is normally set lower toward 11ft lbs as when the weather warms up your power will rise with warmer air = higher pressures.
     
  13. GIRLYPANTS

    GIRLYPANTS Banned BANNED

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    you found your sweet spot :D
     

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