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Tech Help please?

Discussion in 'Anything Airgun Related' started by Frenchie, Mar 22, 2009.

  1. Frenchie

    Frenchie Engaging Member

    Messages:
    267
    Likes Received:
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    Location:
    Bacup, Lancashire.
    O.K. Guys I have a bit of a technical question here that I hope that one of you will be able to answer for me, but before I ask let me clear one thing up please. I realise that some of you have a low opinion of the SMK QB78, particularly the fact that it is a CO2 gun which "can" give power fluctuations in cold conditions, however I have found that the power drop in severe cold with mine is minimal and it still retains its accuracy so I am very happy with my gun!
    O.K. with that said and done here goes:
    My QB 78 Deluxe is in .22 and tuned to put out 11.5 ft/lbs using 18g Bisley Pest Pellets This is fine for the pigeons that I shoot (mainly roosters at close range). I also use the gun for rabbits and have had no real problems but I am thinking that if I go over to .177 I could take on slightly more "rangey" rabbits what with the .177 having a flatter trajectory and not having to compensate for the "drop off of the heavier .22 pellet", something that is not always quite so easy in the dark while working on a lamp and ranges being that little bit harder to judge accurately.
    The question is, if I changed the barrel over to a .177 barrel (Something that is very easy to do with a QB78 and only takes a few minutes) would this alter the power and put my gun over the legal (12 ft/lbs) limit?
    Incidentally, before anyone says it, I know that I would have to re-zero the scopes any time that I changed the barrels!
    Your advice would be very welcome as I do not realy want to buy a new QB 78 and have to tune that one as well!
     
  2. Andy

    Andy Administrative Staff Member Founder

    Messages:
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    1,404
    Location:
    Huddersfield
    Your power would drop as .177 needs more air/Co2 than a .22 Hence why you always get more shots per fill with a .22 than .177
     
  3. dlloyduk

    dlloyduk Active Member

    Messages:
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    Location:
    Sunderland
    As andy said power will drop off. You can get it back up but when you swap back to .22 you will probably be well over the limit. Probably best bet to swap over guns. They are still cheap enough and you can tune for the price of the seals. 50p tune up anyone? Then de-tune it to the limit.
     
  4. Frenchie

    Frenchie Engaging Member

    Messages:
    267
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    14
    Location:
    Bacup, Lancashire.
    O.K. Guys, Thanks for that info, it's not what I was hoping to get but thanks all the same. With that being the case it looks like I would be better to get a .177 and tune it then fit it with a good set of 'scopes.
     
  5. noluv6

    noluv6 Engaging Member

    Messages:
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    Location:
    BIRMINGHAM
    sd custom designs which I believe is www.sdcustom.com or .co.uk does many kit's so it may be worth you getting the 177 barrel and getting a tuning kit.
    My self,I think you should not be hunting with co2,I do understand they can be made good but at the end of the day imagine some one taking a head shot at you and blowing your arm off?Then you run around suffering for 10 minute's while he take's another few shots at you ending you with no legs or arms and still jumping about.Not right is it.
     
  6. Frenchie

    Frenchie Engaging Member

    Messages:
    267
    Likes Received:
    14
    Location:
    Bacup, Lancashire.
    Sorry but I am not sure that I understand your point here my friend. I fully understand that some CO2 guns can suffer from power drop in adverse temperature conditions but I have been using mine (which is tuned to full hunting power) without any problems right throughout the winter. If you are saying that they are not accurate enough to hunt with maybe you should see some of the targets that I have used for checking my scope zeroing on any of the many hundreds or pigeons or rabbits that my CO2 gun had cleanly and humanely dispatched.
    With regards to taking a shot and hitting say a rabbit in the leg and leaving it hopping about while you take another shot then this is poor shooting and inexcuseable, but you MUST ADMIT that this is possible (And I am sure happens more often than anyone will publically admit) with whatever gun you use be it a springer a PCP or a CO2. If people regularly suffer from this problem maybe they should look at and improve their field craft and shooting techniques!
    Sorry, I am not wishing to get in to or start an argument but I just don't understand your point!
     
    Last edited: Mar 23, 2009

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