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Power Check With Jsb Exacts And Heavy

Discussion in 'Technical' started by Tabrighteyes, Jun 30, 2020.

  1. Tabrighteyes

    Tabrighteyes Engaging Member

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    What is everyone’s thoughts on pellet testing in short jsb exact 8.44gr 4.52 vs jsb heavy 10.34gr 4.52 . Will the heavy 10.34gr always put the power up on a chrono over the more standard exact 8.44gr ??
     
  2. JamieB57

    JamieB57 Busy Member

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    Generally in a precharged rifle the power tends to be up a bit with a heavier pellet,but a spring gun it’s lower with the heavier.May only be about half a pound difference though!
     
  3. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    What’s the most accurate?
     
    JamieB57 likes this.
  4. Septic

    Septic Superbus et Vetera

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    That depends on the gun...

    My HW100 loved 8.44gr
    My Superten loves 10.34gr
    My S410 prefered 7.87
     
  5. squib

    squib Posting Addict

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    I’ve just ordered some jsb heavies, as Bisley mags always rob power in any gun I’ve ever tried them with.
     
  6. Tabrighteyes

    Tabrighteyes Engaging Member

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    To be fair my AA ultimate sporter is very good with both 11.2 with the exact and 11.84 with the heavy jsb both just as accurate depending on me of course
     
  7. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Obviously:)

    what’s good in yours, is no use to the op:)
     
  8. Tabrighteyes

    Tabrighteyes Engaging Member

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    Dose any one else have any chrono figures for both pellets from the same gun ?
     
  9. robs5230

    robs5230 Oversprung

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    My Ultra SE's in .177 run approx 0.5ftlb higher with heavys, than they do with exacts
     
  10. brk1

    brk1 Busy Member

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    Haven't checked recently as had a seal go but my HW100 was at 11.2 with Exacts and 11.5 with Heavies, both in your stated 4.52 size and lighter ones were around 11 (Hobby's) , it was running really well then, haven't even sorted it with the enforced lockdown yet as had other projects on the go :thumb: and now back to work if we don't get forced back into lockdown again :(
     
  11. jesim1

    jesim1 Kit bitch to the Stars

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    For a PCP:

    Not always, but most often, and normally around 0.3 to 0.6fpe increase :thumb:

    For a springer:

    Usually the opposite ;)

    Just remember every gun is different :rolleyes:
     
  12. BallisticBill

    BallisticBill Posting Addict

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    It depends on the gun.
    If it's a PCP designed to be sub-12ft lb the heavy pellets will generate more power but that's not necessarily the case with guns designed for higher power then detuned for the UK market.
    In springers, in general, the heavier pellets will produce less power but that's not necessarily the case as the tuning will influence efficiency of different pellets.
     
    sagalout and robs5230 like this.
  13. Tabrighteyes

    Tabrighteyes Engaging Member

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    I’ll be honest my main reason for asking is I ordered a new fx rifle and when I went to pick it up it had no paperwork to back up the de-tune to sub 12 all fx guns have to have for us U.K. non fac holders ! So they chrono it with jsb exact 4.52 and it was 799fps giving 11.97fpe which I said was running to hot and can they please put jsb 10.34 through to check and they came back out very sheepish and told me it was running 718fps giving 11.84 fpe I then asked if they had turned the power down ? After a double look at each other they said no !!! The gun is still at the shop as I told them it had the potential to go over 12fpe and they would not let me see the chrono test in person ( to do it again ) I have never known a 10.34gr to go lower than 8.44gr as my ultimate sporter proved my thoughts when I got home ! What dose everyone think ??
     
  14. jesim1

    jesim1 Kit bitch to the Stars

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    Run, they are 99% lying to you :eek:, and even if they are not - no self respecting RFD would let a sub 12fpe gun out the door doing as close to 12fpe as that, you just know a 1 degree increase in temperature is going to make it illegal - they should not be allowed to run an RFD :facepalm:
     
    hmangphilly likes this.
  15. Locking Nut

    Locking Nut Member

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    String of 10 Exact 8.44@4.52 averaged 11.21ft/lb last time I had chrono on. Exact Heavy 10.34@4.52 averaged 11.52 during the same session. BSA R-10TH.

    As per @jesim1, letting a gun out the door that close to the limit with the lighter pellets doesn't reflect at all well on the dealer. It's not them who'll deal with the consequences if you get pinged.
     
    hmangphilly and jesim1 like this.
  16. robs5230

    robs5230 Oversprung

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    They're having you over.
    Run for the hills.
     
    hmangphilly likes this.
  17. hmangphilly

    hmangphilly Posting Addict

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    I think I would not buy a gun from these people.
     
  18. squib

    squib Posting Addict

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    I did my P15 tonight. For info, it’s reg is set to around 85 bar.

    15.89 5.52 - 11.3ftlb
    Bisley mags 10.1 ft lb
    18.13 5.52 heavies 10.2 ft lb
    express 11.3 ft lb
    Rs 11.3 ft lb.
     
  19. Septic

    Septic Superbus et Vetera

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    And what’s good in someone else’s identical gun, isn’t necessarily going to be the best in his either...
    My neighbour and his son both have identical S400s, bought together.. But neither gets on with the other’s pellets...
    It’s one of the mysteries of life... Which is why everyone should try as many as possible and decide for themselves...
     

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