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Advice Pellet advice for theoben

Discussion in 'Anything Airgun Related' started by tomsteebs, May 3, 2014.

  1. tomsteebs

    tomsteebs Donator

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    Afternoon,

    Been testing pellets at 28yards with a theoben slr98 and 2 are better of what I've tried.

    Pictures of both .22 x 7shot groups:
    [​IMG]
    [​IMG]

    Now I know the AA group isn't brilliant but it is fine for my skill level and my current control of the quite frankly very rubbish trigger.

    Reason I say the Jsb express group is better than others is the fact it is consistently narrow on both groups I did with it but just very tall.

    Could this point to inconsistency in pellets or maybe a direction to go with testing pellets?

    Atb
    Tom
     
  2. Accuspell

    Accuspell Pro Poster

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    The vertical stringing points to your trigger technique. The trigger is fine, it probably just needs setting. You will probably do best with slightly bigger head sizes - try 5.52 and see how you go.
     
  3. tomsteebs

    tomsteebs Donator

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    Thanks, I'm trying different techniques with the trigger as is- as it has no 2nd stage at the moment (is it even 2 stage?) So it's a bit of a learn the amount of pull situation.

    I'll have a look around for trigger guides.

    As for diameter of pellets, the .52 aa field weren't as good as the .51 and I also tried .53 ftt and .52 defiants. Possibly .52 supefields as well.

    cheers
     
  4. Accuspell

    Accuspell Pro Poster

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    Odd - what barrel is on yours then? Fire a pellet (any old pellet, it doesn't matter what) into a bucket of water (from a reasonable distance so you don't get drowned!) Or even a pile of old towels - so you can collect the pellet undamaged and look at the engraving to see what barrel you have on there. That will help a gret deal - my SLR has an Anschutz barrel and I thought they all did - I know at one point they were using BSA but not for the SLR.

    Trigger is definitely a 2-stage, even the clunky Gamo unit and they work brilliantly when set up right.
     
  5. Clubshot

    Clubshot Clubshot

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    My Hw90 gives good reults with Defiant 5.52's @ 14.00's - Gas Ram -

    All Defiants need to find rifling - so need a Clean Barrel to Start with -

    BOB/R
     
  6. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    Crosman Premier Ultra Magnums work well in my Mark 1 Rapid and my Sirocco Deluxe!
     
  7. Tinbum

    Tinbum Delusions of adequacy

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    A trigger shoe works wonders on TB triggers. It also sounds like you need the second stage firming up!
     
  8. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    I don't think the AA group is that bad for the type of rifle and distance tbh (as you know I don't have particularly high opinions of gas ram guns); I doubt the Express group is down to poor pellets - I've found them to be amongst the best available in the past. I'd think either the rifle simply doesn't like them or it's down to hold sensitivity. I'd have thought it less to do with trigger control (IME poor trigger control usually pushes the shots to one side or anther), but it's always a possiblity; especially with such a ropey unit.

    I did try and find some more info on the trigger; found a thread on the bb s where a chap's tidied one up, and also found a diagram (below). I was initially a little suspicious as I couldn't see how the unit could be two-stage; however after a little more thought I now see how it's much like the unit on some later Rapids - it could be described as "true" two stage - the first stage weight is controlled by the load on the sear and that provided by the return spring around the trigger blade's pivot. The additional weight of the second stage is provided by trigger blade coming into contact with the captive, sprung ball; adding the additional load that defines the second stage.

    [​IMG]


    If it were my unit (which I'm thankful it's not :D) I'd be inclined to strip it and polish / lube the sears (this should help with the nasty first stage) and wind the 2nd stage weight screw in (the only adjustment the unit has) to increase the 2nd stage weight to a more predictable setting.


    I know you like Theoben products more than I do and that we'll never agree on the gas ram guns.. but please, have some perspective / objectivity. The triggers on all the rammed guns are hopeless - offering very little adjustability and a heavy, creepy first stage with a poorly-defined second stage that's often pulled straight through thanks to the horrible first stage. Viewed in isolation they're pretty damned nasty and when compared to the HW Rekord and Air Arms CD units they're initially have been pitched against, they're an embarresment tbh.

    As for the Gamo item - a £13 unit that's fitted to / sourced from some of the cheapest, nastiest spring guns imaginable; and that again has sod all adjustment and offers very little definition between the two stages. Just to prove I'm not just brand-bashing I realise that over its lifetime the Rapid had some very good trigger units fitted to it (the Anschutz-sourced items and the final Mk4 unit) however the Gamo unit certainly isn't among them and dressing either of these turds up with a bow and some glitter is really overstating their abilities and isn't helping the OP at all IMO..
     
  9. tomsteebs

    tomsteebs Donator

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    Right to answer some questions:

    I have read the manual and you have one way of adjusting the trigger via a socket head bolt.

    This adjusts the weight of the 2nd stage.

    The trigger was currently set to super light to the point of the bolt being relatively loose and the 2nd stage being obsolete.

    I put this down to either working loose (although I wouldn't have that that to be the case) or to have set this way for preference of a previous owner.

    I then turned it a about 3 rotations until the bolt was not loose and a few threads deeper.
    This gave a heavy second stage, so I unwound it about 1turn and the 2nd stage was completely removed! So I then tried turning it a lot more to see if it was past the "factory adjustment range" and was in a overly unwound position before.

    But this completely locked the trigger! At this point it still had about 1/2 the bolt length to possibly wind in which I thought was strange as it wasn't difficult to wind in either.

    Anyway after this I took it back to where it was a heavy 2nd stage and made it a positive slightly lighter stage (but still heavy)

    It seems to have a lot of travel in the adjustment screw but only a very very small range of trigger adjustment.


    Barrel

    In the manual it states all barrels in the slr series are anshutz and are choked, it also states the 98's also have the underlever ported silencer.

    My pellet rifling looks more anhutzy but it isn't as knife like as a anhustz rapid I had?...

    [​IMG]

    I took a photo of the stock again as it's sunny :)


    [​IMG]
     

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