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Fx Superior Liner

Discussion in 'Firearms Certificate (FAC) Guns' started by Teuchter Boy, Jul 31, 2020.

  1. Teuchter Boy

    Teuchter Boy Engaging Member

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    Well tonight, having now received the correct 700mm barrel for my Mark 2 25cal pp Impact I thought I would install the superior liner I bought a few weeks ago from sgc. To my surprise the 700mm barrel was already sporting the superior liner (I now have two.... :facepalm:).

    In any event with fading light I ran some JSB Kings, Mark 1 Heavies and Hybrids through it and to my surprise they all shot brilliantly at 50 yards at 895ftps, 775ftps and 835ftps respectively. I will test the Hades tomorrow during toddler nap time but already looking like I have no reason to fiddle with the Impact for now as it is shooting everything fine with the regulator at just under 110 bar.

    I appreciate many on here shoot all three of these pellets at much faster speeds with amazing results at 100 plus yards but I won't be hunting past about 80 to 90 yards so happy with the lower power. Might push the hybrids faster out of curiosity but for now just going to enjoy the rifle having waited so blo*dy long for it during lockdown.

    Would be interested to hear what speeds other fx impact owners are shooting these pellets for the best results. Also would it be incorrect to say the superior liner seems to slow pellets down as I got the same speed with the Kings using the 600mm without any changes to the settings, thought the 700mm would give me 20 to 40ftps more but turns out to be just the same speed......
     
  2. Spray1Mark

    Spray1Mark Major Poster

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    Picked up an outer of the FX HYBRIDS in .25 today, run about 970 for best results!
     
    Teuchter Boy likes this.
  3. Teuchter Boy

    Teuchter Boy Engaging Member

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    @Spray1Mark what reg pressure did you need to run them at that speed? Also I presume pushing them faster is subject to the law of diminishing returns in terms of accuracy given how well they shoot at 835ftps. Still somewhat intimidated by all the variables to start fiddling so very useful to learn from you guys who have done all the hard work researching what works best.
     
  4. Spray1Mark

    Spray1Mark Major Poster

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    You can run at 120 bar, the higher speeds really make a difference past 50 yards, which in truth is what slugs are about and yes the superior liner does seem to have some weird effects on velocities from pellets to slugs.
     
    John Entwistle and Teuchter Boy like this.
  5. GAUGE

    GAUGE Engaging Member

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    My FX crown .25 is doing 945 with FX 25.4 GRN at 50flbs reg set at 147 bar
    The Hades are super accurate the hybrids are excellent to but no better than the the Hades the slugs are faster thought 600 mm barrel
     
    Teuchter Boy likes this.
  6. Teuchter Boy

    Teuchter Boy Engaging Member

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    @GAUGE thanks for the information. Tried the Hades last night at 875ftps. I appreciate I probably need to speed everything up to get the best accuracy. If I can get the heavies up to 850ftps this should also work well for the hybrids at close to the 970ftps Spray1Mark recommended. I can always turn the hammer spring wheel down if this is too fast for Kings or Hades.
     
    GAUGE likes this.
  7. GAUGE

    GAUGE Engaging Member

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    One thing I noticed that when the pressure drops to about 120 bar from the bottle the pressure gauge on the reg also drops slightly s this normal as only had the gun a couple of weeks
     
  8. Teuchter Boy

    Teuchter Boy Engaging Member

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    I am an impact newbie myself but as my reg is at 110 bar I can't say I have noticed any change in the gauge. I haven't shot below the reg pressure of 110 bar but presumably if I did then the gauge would also start dropping commensurate with the pressure in the bottle. If you reg pressure is set at 120bar then this would explain the drop in your reg gauge if and when you shoot below this pressure in the gun. I would add I don't think the gauges are that accurate so your bottle and reg gauge may not be reading the same pressure even when the gun is off the regulator. This could all be nonsense so someone with more experience may wish to chip in.
     
  9. GAUGE

    GAUGE Engaging Member

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    Thanks kinda makes sense
     
  10. Teuchter Boy

    Teuchter Boy Engaging Member

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    @Spray1Mark you inspired me to fiddle with the impact this afternoon after watching loads of tuning videos on YouTube this morning when I was supposed to be drafting complex legal documents. Ah well there is always tomorrow. On the plus side using the hammer spring and valve adjuster (wanted to limit my variables) I got the heavies up to 850ftps with the hybrids shooting at 925ftps on the same settings with valve knob at three bar. If I turn the hammer spring knob from max to 4 I can then shoot kings at 890ftps. After lots of fretting it was actually quite painless as I took things slow and steady. Happy days. The hybrids are now pretty much just one hole at 50 yards with the heavies not far behind, subject to me doing my bit. I don't doubt upping the reg pressure by five to ten bar would get me to 979ftps with the hybrids but that is a job for another day.
     
  11. GAUGE

    GAUGE Engaging Member

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    I'm still getting to know my FX crown I'm a bit confused about the reg pressure
    Mine is set on around 147 nugging 149 bar ive been looking at u tube some FX owners have got Thiers on 120 Mark or less and still getting 900 odd FPS so I'm asking myself the lower the regulator pressure the more shots per fill at around same velocities advice please
    Also I'm still only taking rabbits at no more than 40 yds untill I get use to the rifle
     
  12. Spray1Mark

    Spray1Mark Major Poster

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    The sweet spot for .25 was always 140 on the reg, with the Crown you cannot limit airflow to increase efficiency like you can with the IMPACT hence you waste air, you could back everything off and balance the reg and hammer spring adjuster and indeed get more shots but IME with the Crown you don't improve accuracy any, better to actually shoot the 34g KING HEAVY MKII at 870-880 at the same set up as you have with the .25 and enjoy the extra power for nothing as the wasted air will be utilsed with the heavier pellet.

    How many shots do you need on an average outing, do you have to re-fill in the field?
     
  13. Spray1Mark

    Spray1Mark Major Poster

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    You must not rely on the line markings on the valve adjuster, they are wholy un-repeatable, winding in or out has massive amounts of backlash, use instead a caliper to measure the gap and use this as a guide WHILST winding in (i.e. compression on the set-up), does that make sense?
     
    Teuchter Boy likes this.
  14. Spray1Mark

    Spray1Mark Major Poster

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    You may also find you have to fire the gun quite a few times for the valve to stop on the ball or O ring to set the limit of travel, hope that makes sense as well?
     
    Teuchter Boy likes this.
  15. Teuchter Boy

    Teuchter Boy Engaging Member

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    Thanks @Spray1Mark, I appreciate you taking the time to help us out. Unfortunately I didn't measure the valve before I pushed it all the way out. When screwed back in it reduced the fps by around 15 having increased it by 12 or so when screwed all out. I understand the mechanics of the valve spring the reality of it is still confusing. In this instance I just maxed out hammer spring and valve and then dropped the hammer spring back a bit and then did the same with the valve after getting around 20ftps over my target velocity. Despite my ignorance the rifle seems to be shooting quietly and accurately at the targeted ftps for the heavies, beginners luck....
     

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