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Bad news Rm8 Power Creep

Discussion in 'Anything Airgun Related' started by One Shot Wonder, Nov 8, 2019 at 4:33 PM.

  1. One Shot Wonder

    One Shot Wonder Member

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    Just a bit of a heads up for rm8 owners, I bought my rm8 varmint in June this year, chronod it and was happy with the 11.5ft/lb with jsb exact 4.52s.....
    It's now had probably about 2500-3000 pellets through it.
    I recently borrowed my mates chrono again just to check as it sounded louder than it had before.... checked it again with the exact 4.52s.... not a good result.... phoned pellpax and they have arranged to collect it asap and get it sorted for me.

    Now, I'd read a few people had problems with the power being low when they got their rifles, maybe they were relying on the power going up on its own like mine did....

    Anyone else had this?
     
  2. Thewelshwonder

    Thewelshwonder Busy Member

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    Location:
    Blackwood South Wales
    My RM8 was 12.56 straight of the box so obviously it went back and I’ve now got a HW100
     
  3. One Shot Wonder

    One Shot Wonder Member

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    What pellets was that with?
     
  4. genesis

    genesis Engaging Member

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    Location:
    county durham
    My r8 never went higher than 10.35 even with magnums
     
  5. Thewelshwonder

    Thewelshwonder Busy Member

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    Location:
    Blackwood South Wales
    Air Arms Diablo fields
     
  6. Bunny-on-Bunny

    Bunny-on-Bunny Engaging Member

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    Mine does 11.7 with the fastest pellets my gunsmith has, will have to keep an eye on it.
     
  7. One Shot Wonder

    One Shot Wonder Member

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    Mine was spitting exacts at 800+fps and heavys at 760+fps

    The only thing that's altered is I've added baffles to the backdraft mod, could that be the cause?
     
  8. sussexa

    sussexa Member

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    i find a mod increases fps 5-10fps on guns ive tested , how would the law test the gun ? as found or mod off ? i have recently been trying to tune a .177 rm8 and without playing with reg am left with only hammer spring, was very surprised as my .22 i barely polished the ends and reduced spring length 1mm and was able to set power as required with some .2mm shimsin hammer end, on this .177 i ended up with 5mm or more off spring to get down to 11.5ftlbs there is a lot of free play on hammer now so from what ive seen on here could be considered an short stiff spring set up now?was just surprised how kept taking a mm off at a time was doing next to nothing sitting at 770 with sovs now but not a very tight fps spread +/-10fps
     
  9. One Shot Wonder

    One Shot Wonder Member

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    But I haven't changed the mod, just put some hair curler type baffles in it... surely that wouldn't up the power by almost 1ft/lb
     
  10. sussexa

    sussexa Member

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    no not 1 ftlb from mod , pellets were same , ive seen a 1ft lb variation on pellets easily, did you recently lube anything , maybe some high spots on the hammer bedding in spring seat faces etc or the reg changing , thats why shooters needs to chrony regularly, things settle ,wear , change.
     
    Bunny-on-Bunny likes this.
  11. One Shot Wonder

    One Shot Wonder Member

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    Yep, same pellets. Only thing I've done is clean the barrel but It normally gets cleaned after about a tin of pellets so nothimg new. Dont know anything about hammer spring etc but I do need to learn and I do need to get my own chrono... It's on my Christmas list
     

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