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Baffling POI shift HW97k ????

Discussion in 'Anything Airgun Related' started by Prosport.22, Dec 30, 2013.

  1. Prosport.22

    Prosport.22 Posting Addict

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    This is driving me mad! I am currently using a .22 HW97k fitted with a V mach kit, (so very consistent). Mounted to it is an AGS 4-12x40 mil dot SWAT scope. I am using the same pellets and batch Powapell (which generally it loves) I have used this combination for the last 18 months or so with devastating accuracy. pellet on pellet out to 35-40 yards, hitting a 100 yard 6" metal disc every shot. I have only ever had to adjust the scope if it was taken off the gun for gun servicing.
    Went out yesterday and couldn't hit nothing!.
    Almost every shot was wandering high, low, or to the left, right by as little as an inch and as much as 4 inches...:confused:.

    On re zeroing the scope, it would stay on the bulls eye for say 4 shots then start wandering again.:mad:

    I tried a change of 2 different pellets with the same result. On getting home, I have checked the scope and all screws were tight. I have shot a group of the same pellets over a chrono, on 10 shots 2 were way off, but 8 showed a deviation of an average of only 8 FPS.

    I have not delved into the rifle as yet. I would be very grateful for any opinions on this. My mate seems to think the scope may be at fault. But as stated earlier, I have never had to adjust it, all the turrets are nice and tight, with very positive adjustment.

    Help please....:eek:
     
  2. rattus

    rattus Donator

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    dirty barrel maybe. is the scope springer rated? recoil over time may have shook the scope loose.
     
  3. SteveO

    SteveO Top Poster

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    Make sure your scope mount bolts are tight!

    I know someone who didn't and he couldn't hit a barn door with a banjo! :p:D

    No Names!!
     
  4. timmytree

    timmytree Pro Poster

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    Do a barrel clean first just to rule out that possibility, after that the prime suspect has to be the scope, everything may be tight but that doesn't rule out a weak erector spring or similar. Try another scope if possible or try your scope on another springer.
     
  5. loki_79

    loki_79 Donator

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    If you have a cheap laser that you can mount to your scope, then you could try observing the relative position of the aim point vs the laser dot at your target distance before/after each shot. You will easily see if the scope is fubar. This could also be done with some kind of boresighting kit, but that would be more of a pain as you would need to remove it for each shot. My money would be on the scope. The only other thing I can think of is have your stock screws worked lose?

    edit: fixing a laser to the scope will only work if it is a fault with the scope, and not if the scope mounts are lose.
     
    Last edited: Dec 30, 2013
  6. Akita177

    Akita177 The Absolute State of Britian podcast

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    Dont powapell have pretty heavie lube/coating on them?
    The wind was fairly strong yesterday here a couple of targets needed maybe 4-5 inches of wind hold over to hit the killzone, while some you just aimed in the kill when the wind dropped suddenly.
     
  7. Prosport.22

    Prosport.22 Posting Addict

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    Thanks for the input guys, I will try cleaning the barrel and checking the stock bolts etc. Also the laser,(if I can find one) but what puzzles me is the last time I took it out it was fine, do scopes just instantly develop a fault? :confused: yes, it was windy yesterday, my mate was hitting the 100 yarder in spite of the wind. I just gave up after hitting it 1 in 10 shots. Its not even if there is a recoil related possibility of scope damage, as the gun has been tuned and shoots like a pussy with only a nudge on shot release.....:confused:
     
  8. RichieRich

    RichieRich Ping!

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    Possible piston seal failure. Cheap to replace.
     
  9. loki_79

    loki_79 Donator

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    Another way to rule out the scope is to put a different scope on yours - it is a pain to take one off another gun though, so not easy unless you or a mate have a spare one.

    Just to confirm, was there any pattern at all to the missed shots (i.e. vertical/diagonal stringing) or were they truly all over the place?
     
  10. Prosport.22

    Prosport.22 Posting Addict

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    Hi Loki,

    I can confirm the POI was totally random, (no stringing) only adjusting the scope would bring it back on zero, but only for several shots before it started wandering again...................:rolleyes:
     
  11. Jackroadkill

    Jackroadkill Donator

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    I had a similar problem with a Nikko Sterling Mountmaster 3 - 9 x 50 that I was using. It would zero perfectly, hold zero for a few shots and then if I touched the AO, the zero would go to pot instantly.

    Scope was knackered - I tried it on several rifles (PCP, springers, .17hmr and .22lr) and it was the same for all of them, so it had to go.

    It certainly sounds like a scope problem, so I'd agree with the suggestion to change the scope for one you know to be in good working order and see what results you get.
     
  12. Prosport.22

    Prosport.22 Posting Addict

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    I think you are probably right....:mad: only because you mention moving the AO, the SWAT is a side wheel AO, its when you change the mag and adjust the focus, the problem presents. I am gutted as the optics on the AGS are very good. Is there no way this can be repaired or adjusted....:confused:

     
  13. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    I'd agree about the 'scope being the prime suspect (try another or use loki_79's laser trick), followed by the stock screws. Also check the security of the muzzle assy and underlever latch.

    Finally (not that I want to be the doom-monger) but I've also seen HW97s fail at the weld between the cylinder and barrel block; causing the whole barrel and underlever assy to move with respect to the cylinder... rare but worth checking IMO ;)
     
  14. thevoid

    thevoid Posting Addict

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    As this in a 97k, does it have a moderator on it? if so it could need a clean out or may have even gotten bend slightly and its clipping pellets
     
  15. wonky donky

    wonky donky Donator

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    Yes I agree it's almost certainly the scope, I take it you also get point of impact shift when you change magnification too? try another scope.

    I had a Big Nikko Diamond 10-50x60 did the same thing, got it replaced under warranty.
     

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