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Question New Hammerli losing power after 2 or 3 shots

Discussion in 'Anything Airgun Related' started by rrandy, Aug 15, 2014.

  1. rrandy

    rrandy Newbie

    Likes Received:
    Just bought a Hammerli 850. Using Venturi 88 g CO cannisters.
    After firing 2 or 3 shots, the power goes down dramatically.
    Thinking I may have not screwed in properly, I backed it out and of course lost all the CO2.
    I did this twice with same results.

    Are the seals defective on the rifle?
    Or am I installing CO2 incorrectly?

    I screw it it until it stops.

    Any thoughts from anyone??
  2. Greg1983

    Greg1983 Busy Member

    Likes Received:
    If its like the QB/XS co2 guns you need to cock the bolt back then fit the co2 canister hand tight then push bolt in and dry fire it once or twice so it pierces the capsule.
    If you don't do it the canister can pierce as you screw them in and pressurise before its screwed in properly there for any pressure change can cause slow leaks, so if your willing to sacrifice a new co2 try cocking the bolt and screwing it in tightly by hand then fire it dry and see if that helps.

    Cheers, Greg.
  3. fatbob

    fatbob Engaging Member

    Likes Received:
    Kilmarnock, Ayrshire
    They're the same cannisters as used on xs79 try UKCAF for more info as Greg says draw the bolt back and try dry firing I know from experience With a qb78 I fit capsule(s) and screw tube cap up tight back off half turn you should hear the hiss when punctured, dry fire to burst second cap. As said there's a few lads at UKCAF to put you right and some have converted the 850 to hpa if you fancy that route ;)


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