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R10 Accuracy Issues

Discussion in 'Technical' started by nudgermanning, Aug 27, 2019.

  1. nudgermanning

    nudgermanning Member

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    Recently ive been having serious accuracy issues with my BSA r10 se. Up until now the gun hadnt missed a beat but now its gone so bad, its unbearable. Im talking about a 50mm spread from a 20 yard indoor zero as indicated in the attached picture. Ive done the usual tightening of the stock bolt and making sure the mounts are securely fastened and Ive also changed the reg from the standard bsa one to the huma reg from xtx as i believed this was the issue however the problem still remains. I really dont want to get rid of the gun as i really like it however theres only so much money i can afford to throw at it. Any suggestions will be greatly receieved
     

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  2. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Have you tried it without a silencer?
     
  3. john79

    john79 Big Poster

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    breach seals need changing ! clean the barrel
     
  4. Paul55

    Paul55 Posting Addict

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    Give the barrel a clean?
     
  5. That hurts

    That hurts Barely Active

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    As Stevie suggests could be mod clipping. Also worth cleaning the barrel thoroughly if not already done. Have you changed pellets as if you are using short ones, they can cause problems in the mag unless pushed further home or reverse loaded from the front, skirt first. Breech seal.
     
    Husky-loves-to-run likes this.
  6. robs5230

    robs5230 леший

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    As its a sudden change I'd go with the moderator baffles being damaged or the barrel is fouled and needs cleaning.
     
  7. Husky-loves-to-run

    Husky-loves-to-run Busy Member

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    Yep my first look would be the above, clean the barrel and check for clipping at the mod. If you haven’t changed pellets that is?
     
  8. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    It could also be a different batch of the same pellet.
     
  9. Lev Levvin

    Lev Levvin Pro Poster

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    57630E23-DC5D-4680-9CA5-0658E46E3E18.jpeg Moderator...
    Check for clipping marks in the moderator muzzle
     
  10. mike-carter

    mike-carter Pro Poster

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    As above but also have you another scope to try?
     
    Wing Commander likes this.
  11. Patrick

    Patrick Donator

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    Just for clarity did the inaccuracy occur shortly after or immediately after you changed the regulator or was the gun fine after the regulator change and it 's something that has recently just happened either way the fault may lie with the regulator. Although Huma regs are supposed to be superior to and more reliable than the BSA unit they're not foolproof and the fault could lie there. if you've checked all the obvious things which you say you have then as Mike says it might be worth trying a different scope just to eliminate that could be the cause although considering it's a pcp and not a springer i doubt if that's the problem unless it's had a fairly hard knock at sometime.
    If it hasn't had one a barrel clean may solve the problem as others have suggested. If the breech seal is faulty i.e leaking then that would affect muzzle velocity so is the inaccuracy allayed to significant MV variation. If it is then the breech seal could be the cause.
    I assume you were using the same pellets both before and after the inaccuracy occurred.
     
  12. Tim_B

    Tim_B Pro Poster

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    Some good advice given. You may also want to put the old reg back in and try again - if it was working well before the reg change and nothing else has changed, then it could be the root cause.
     
    border likes this.
  13. Mullet99

    Mullet99 Busy Member

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    Mine opens up a tad now and then..but a good barrel clean sorts it :thumb:
     
  14. nudgermanning

    nudgermanning Member

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    Thanks for all the sound advice. The issue was there prior to the changing of the reg but the old reg also started leaking air so i thought the two problems might be related. I have recently upgraded the mod to a huub shroud which might be the issue although im really hoping not. Ill put the ccs system back in place and see if it makes any difference. The other thing ill try is a changing of the breach seals
    Regarding pellets, ive tried both jsb diabolo 15 grain and the heavier 18 grain and its happening with both types. Ive also tried loading the pellets in individually to rule out the mag being faulty.
     
  15. Lev Levvin

    Lev Levvin Pro Poster

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    Are you certain that the shroud is sitting perfectly true?

    I was getting clipping problems because shroud/mod combo wasn’t perfectly straight
     
  16. Reg Abercrombie

    Reg Abercrombie Well-Known Member

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    change one thing at a time m8 or you wil not know the cause of your problem.
     
    Lev Levvin likes this.
  17. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Is there a gap between the shroud and the breech block? Should be a gap about the thickness of a business card

    Definitely try the shroud first in this order.

    Without shroud and barrel adapter.

    With barrel adapter.

    With shroud (no internals)

    :)
     
    mikeyhall1 and Lev Levvin like this.
  18. TrickyDicky

    TrickyDicky Life in the slow lane

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    Also worth checking the magazine alignment if out they can catch the pellet skirt and head and damage it....try with a single shot loader and compare.
     
    32:1 likes this.
  19. Dennis74

    Dennis74 Active Member

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    I would suggest to start with gathering chrony data. This tells if the entire airflow is consistent. (Reg, probe o-ring, tp-oring etc.)

    Then try with different moderators and put another scope on it.

    My latest -accuracy influencing- issue with the R10 was the probe- bolt jumping (do a Google search) It was caused by this bolt coming loose.

    This gave the exact accuracy problem (vertical spread).




    [​IMG]
     
  20. That hurts

    That hurts Barely Active

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    Try cleaning the barrel first and do a tissue test on the breech
     
    Husky-loves-to-run likes this.

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