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Question Different Pressure, Different Pellet?

Discussion in 'Anything Airgun Related' started by TinCan Tony, May 25, 2018.

  1. TinCan Tony

    TinCan Tony Can I video that?

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    This might seem like a strange question, but I'm good at them!

    My RM8 works very well with AA Diabolo Field. But, it's more accurate when the rifle pressure drops to about 150 Bar and below, although below 90 Bar the pellets start dropping like flies. It's perfectly fine at 230 Bar, but it's harder to hit the zero point accurately. Is there anyone out there who uses (say) two different pellets based on the accuracy of your rifle at different pressures? I haven't tried this yet myself, but I'll have a go at it this weekend, just to find out if I could do better using a different pellet from 230 Bar down to 150 Bar.

    Just asking.
     
  2. robs5230

    robs5230 Oversprung

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    Better to fill to the pressure to get in the sweet spot of the power curve and stick to one pellet
     
  3. mikeyhall1

    mikeyhall1 Amazing Poster

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    As this mate
     
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  4. hughlle

    hughlle Very Active

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    Would it be possible to fit a regulator to this gun if shot count is a concern? Otherwise the above posts seem valid.
     
    Last edited: May 25, 2018
    Simonsays and TinCan Tony like this.
  5. TinCan Tony

    TinCan Tony Can I video that?

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    That's about what I thought the answer would be, and that's what I was thinking of doing. But, you have to ask these questions, don't you? :thumb:
     
  6. TinCan Tony

    TinCan Tony Can I video that?

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    Yeah. My thoughts exactly. But I just thought I'd ask :thumb:
     
  7. TinCan Tony

    TinCan Tony Can I video that?

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    All above posts are valid. Just thought I'd ask, that's all.
     
  8. hughlle

    hughlle Very Active

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    I did a Google and it looked like a regulator might be possible. I just don't like the idea of having a gun with such a high shot capacity, but have so much of that questionably usable
     
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  9. robs5230

    robs5230 Oversprung

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    Its all about finding where the useable shots are. It involves a chrono, a bit of time and a couple of hundred pellets.
     
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  10. littleJon365

    littleJon365 Democracy unless they disagree

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    Get a reg fitted. Consistency issues then resolved :thumb:
     
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  11. john harris

    john harris Busy Member

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    doesn't it already have a reg (or something like it.... a bell...… something valve)
     
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  12. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Yes, supposedly the RM8 has a reg. Of course, how effective it may or may not be is anyone's guess..
     
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  13. TinCan Tony

    TinCan Tony Can I video that?

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    Like some others have commented, I was under the impression that the RM8 is already regulated.
    My best guess is the effect of the Weihrauch silencer on the end of the muzzle. Going to remove it tomorrow at the shooting range and see if the rifle is more stable across the whole pressure range. When you understand how a silencer works (and the Weihrauch is more of a silencer than a moderator) it sort of makes sense that the higher the pressure, the more 'kickback' will be produced (albeit, very minor, and most people report this as a bit of a 'bump' when pulling the trigger). And as the pressure drops things become more stable. If that's the case, then I'll pressurise the rifle to only 150 Bar when I'm plinking at home with the Weihrauch fitted (stops the neighbours complaining). Yes, I know, this will probably mean I'll have to keep re-zeroing the rifle between shoots, but it's something I can live with.

    Thanks for all of your comments.
     
  14. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Will be interested to see your results, but I don't for a minute think the mod (or "silencer" - same thing ;) ) is going to make any difference.

    Even if this argument held water, if the reg was working properly it'd be a moot point since the reg should be ensuring that the gun is operating at broadly the same pressure anyway.

    I think more likely the reg's doing a crap job and the gun isn't set up very well, exacerbating matters.
     
    TinCan Tony likes this.
  15. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Oh - you might also want to put a full string over a chrono to see what it throws up!
     
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  16. TinCan Tony

    TinCan Tony Can I video that?

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    Very, very good point indeed there, cloverleaf. :thumb:
    I'll see what happens at the shooting range tomorrow. Can't remove the Weihrauch at home because the neighbours will have the SAS on my doorstep within 5 minutes!
     
    cloverleaf likes this.
  17. zip ting

    zip ting Engaging Member

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    I would wonder about the pellets, they can vary sometimes, I used to buy boxes of Premiers
    die X for consistency with my Daystate rifles but they liked Superdomes if I sorted them.
    If you have put a lot of pellets through, might the barrel need a spring clean?
     
    TinCan Tony likes this.
  18. TinCan Tony

    TinCan Tony Can I video that?

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    Don't worry, zip ting, I maintain the rifle very well. Everything's cleaned and oiled after about every 500 shots or so. Having tested many different pellets I always thought my RM8 was best with Superdomes, but, it now works very well with AA Diabolo Field at 150 Bar. :thumb:
     
  19. TinCan Tony

    TinCan Tony Can I video that?

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    Well, what a fooking difference.
    Went to the shooting range today and four of us (me, Mrs TinCan, daughter and son-in-law) put about 200 shots through the RM8 with the Weihrauch fitted at 20M. Everything was fine. Had some breakfast and started session two at 40M with the Weihrauch removed. Without doubt, the pellets were hitting the target much harder, much faster and more accurately. The pellets were hitting the 40M target at about 50% faster than they were at the 20M target (from muzzle crack to impact), and the impact sound was noticably louder and harder.

    Go figure o_O
     

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