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Scope issue, gun shooting low, not sure what to try next

Discussion in 'Anything Airgun Related' started by 300bhp/ton, Jan 11, 2016.

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  1. 300bhp/ton

    300bhp/ton Engaging Member

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    Apologies if this ends up long winded. Just looking for some tips/advice on what to try doing next.


    I have a Crosman 2260 (single Co2 .22 rifle). Had it many years and for the money it's a perfectly nice gun. No recoil and very very light handling.

    The stock sights are a bit pants however, so despite having owned the gun for 10 years or so. I decided for the first time last week to fit a scope to it.

    I ordered up some scope mounting blocks off ebay. For those that are familiar with Crosmans, you need these additional mounting blocks, which clamp onto the barrel and provide a 3/8th dovetail. This is the same for other Crosman guns such as the 2240 and 2250 Ratbuster.

    Anyhow clamps fitted (which sadly didn't seem to clamp well, but that's another issue). And an old BSA 4x32 scope fitted. Nothing fancy.



    I assume it should "just work". But the scope appears to be aiming high compared to where the gun shoots. I've got the scope adjusted all the way and it's still way out. I even tried adding a small foam block between the scope body and one of the rings to try and angle it. It improved, but it is still shooting 1-2" lower than where you aim.


    The gun seems fine power wise, so I don't think it's a lack of fps causing it to actually shoot low, for example at the same distance I was getting the 2260 to penetrate targets better than my BSA Meteor .177. Some pretty tough like a fairly thick plastic traffic cone. The .177's sometimes didn't make it though, but the .22's did.

    Distance was 15-20 yards.


    My assumption is, the scope is simply physically pointing higher than the barrel. And I'm not sure what to try next. I used to use this scope on a BSA rifle and my Webley Tracker and it was fine on them, for similar shooting.

    Hoping someone has some ideas on what might be causing this issue. Thanks.
     
  2. monsta41

    monsta41 Donator

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    possibly because it's co2. .it suffers from lower preasure when the temperature drops
     
    Last edited: Jan 11, 2016
  3. surrey shooter

    surrey shooter Donator

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    Co2 not to good in the cold, you will always find zero shift with co2.
     
  4. Tac

    Tac Donator

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    As the people above have said, its most likely down to temperature effecting CO2 performance. Hope this helps.
     
  5. imorik

    imorik Busy Member

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    What distance are you shooting at, ideally for .22 you need to be zeroing at around 25 yards. Point of impact will be lower if you are shooting at a closer range. Only option is to pack the rear mount (between scope and bottom mount) with some kind of flexible plastic shim, foam isn't suitable as it'll squash.
     
  6. terry1001

    terry1001 Major Poster

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    The scope mounts used on those are pretty poor unfortunately but firstly you will need to get them to clamp up firmly, may need some filing/sanding on the mating faces to allow the bolts to clamp it properly. Other things you can try are:
    swapping the clamps around
    swapping the scope mounts around
    don't do both at the same time though.
    You can try some shimming to raise the rear of the scope but be careful because those little scopes aren't very strong and you could damage the tube if you shim too much.
    It's possible that the barrel is bent slightly, you can check that with a steel straight edge. It is possible to straighten the barrel depending on how bad and where the bend is.
    If you're going to use shims then you'll need material which is thin and won't compress - old film negative is good or small pieces cut from an aluminium can will do.
     
  7. Tripleteer

    Tripleteer Donator

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    Temperature!! But you can't mount your scope using foam!!!!
     
  8. 300bhp/ton

    300bhp/ton Engaging Member

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    I'm not convinced it was temp related, the rifle shoots fine with open sights and it really wasn't that cold out, and I've certainly used it in colder conditions with the open sights and not had an issue. It was also shooting consistently throughout an entire Co2 capsule with a very sudden drop off at the end.

    I didn't count how many shots, must have been around 30, and apart from me wobbling, they'd all land in pretty much the same place. Then you'd have a massive drop in power the next shot, 6" drop. Just to check fire one more than it'll hit the ground a few feet short of the target.

    It was consistent in this behaviour over 4 Co2 capsules.

    And as I say, it seemed to be out performing my .177 BSA consistently.
     
  9. bf95

    bf95 Donator

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    With co2 the power drops with every shot and when you come to the end of the capsule you will see a large drop in power like you have mentioned where it's 6" from the group then a few feet away. This is due to there being not enough presure in the capsule. Think of a deodorant can.. When its new it sprays loads.. When its half way through its not as effective at spraying..

    Co2 doesn't perform as well in cold weather as it does in warm weather as mentioned above so you will always experience power and poi variances. As people have mentioned above try swapping the mounts around and padding with plastic strips, I've used electrical tape several times and it works quite well.
     
    Last edited: Jan 11, 2016
  10. 300bhp/ton

    300bhp/ton Engaging Member

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    Thanks for the replies. I still do not believe this has anything to do with Co2 or ambient temp, as the gun with this scope is shooting low all the time.

    I have found this video on YouTube, which seems to offer a reasonable explanation of what is happening, and a possible solution.

    https://www.youtube.com/watch?v=D-nKT8hsfq4&ab_channel=AirgunExperts-AirgunWeb/AirgunWebTV

    In essence I attempted the same, only using some rubberised foam sticky pads, as I thought they would be non damaging and lift the rear of the scope slightly. I think I'll try this method in the vid next. Although I have found some scope mounts that allow adjustment for barrel droop at £29.95, which might be what I need to do ultimately.
     
  11. RichieRich

    RichieRich Ping!

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    Have you tried swapping the two ring mounts around? i.e. front to the back and vice versa? You might have a mount that is slightly out, or the barrel block scope mount might not be the same height as the rear rail on the breech block
     
  12. Jed Clampit

    Jed Clampit Posting Addict

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    This might be a bit obvious, but from your "it should Just work" comment, have you zero'd the scope??
     
  13. 300bhp/ton

    300bhp/ton Engaging Member

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    Sadly yes. Spent most of Saturday afternoon faffing about with it, taking off, swapping bits around. But a consistent result.

    I think the YouTube vid I linked too seems to match up with the issue I'm having.
     
  14. 300bhp/ton

    300bhp/ton Engaging Member

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    Yes, maybe I wasn't clear in the op. That is the exact problem, I can't zero the scope, because despite adjusting to the maximum it is still shooting low. There is no more adjustment left.

    However the YouTube vid I've linked to a few posts back explains this as barrel droop. With the easy solution of lifting the back of the scope up via some home made shims. This is essentially what I attempted on Sunday, although unsuccessful. Having now seen how he does it in the vid, I'm going to try that.
     
  15. bf95

    bf95 Donator

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    I don't mean to be rude and it may be a daft question you're not using the windage turrets as the elevation turrets? They often have less movement than the elevation ones.. As I say I don't mean to be rude asking it. Hope you get it sorted soon.
     
  16. gasman

    gasman Up a bit,,,,,,,

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    :popkorn::shrug::amen::first:This is awesome
     
  17. That hurts

    That hurts Barely Active

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    You beat me to it Gasman :mad:
     
  18. mattyts

    mattyts Donator

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    Got the scope on the wrong way round?
     
  19. gasman

    gasman Up a bit,,,,,,,

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    Or is he holding the gun the right way around ;)
     
  20. RichieRich

    RichieRich Ping!

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    I wonder if he's tried premium gas? This might solve the issue ;)
     
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