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.177/.20 Fac?

Discussion in 'Anything Airgun Related' started by Chris_Brads, Feb 3, 2019.

  1. Chris_Brads

    Chris_Brads Impressive Member

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    I've never had an FAC and I don't plan on getting one atm. But if I got a permission again - I'd definitely look into it. Has anyone had experience with FAC air rifles in sub .22 calibre, does it have any benefits at all? I notice you can buy .177 pellets weighing over 20 grains, but then, why not just get a .22!? I remember watching a YouTube video on the Ted's Holdover channel - he had a .177 HW100 FAC and he decided it was too powerful because at very high velocities he discovered diabolo pellets become unstable. I'd be very interested to hear everyone thoughts on the subject - Cheers
     
    talent and Sanguinius like this.
  2. TonyB55

    TonyB55 Engaging Member

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    It would seem that over circa 900ft/sec you are running into unstable area. It is the switch from super sonic to sub sonic (I think called transonic stage) is where the instability comes in. This is dependant on range, so if you are hitting your quarry at super sonic speeds it will be accurate. It is the slowdown that gives problems. More powerful air guns shoot heavy pellets which reduces speed, but may carry more energy at distance. Chairgun may be your best friend.
     
    Chris_Brads likes this.
  3. bucketboy

    bucketboy Big Poster

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    .177 at 900fps travels exactly the same speed as a .22 at 900fps but it will use more air and make a small hole.

    Answer complete!

    Bb
     
    keithy likes this.
  4. Spray1Mark

    Spray1Mark Pro Poster

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    There is an interesting side to this and it is the JSB .177 13g or 16g pellets. You can make 30FT/LBS with the 16g and the .177 Daystate Wolverine HP is based around it.

    Pretty much, power with FAC air will only increase with pellet weight as the speed is limited, however a .177 projectile travelling at 900FPS but having the same weight as a .22 projectile traveling at the same speed will be more efficient at traveling through the air if that makes sense.

    But as BB says above it will require more air than a .22 pellet would all else being equal.

    What will really change this is if they bring out a .177 airgun slug, then the velocity is no longer a limiting factor as slugs have a much higher BC and can be pushed a lot faster.

    Downside to that is slugs are as expensive, if not more than high quality rimfire ammo, so except for the challenge and less risk with carryover you may as well shoot a rimfire.

    I will be experimenting with some .22 slugs shortly just for fun, but they cost 20p each.
     
    talent, Ghost88 and Chris_Brads like this.
  5. Chris_Brads

    Chris_Brads Impressive Member

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    @Spray1Mark Have you seen the H&N Pile Drivers and Rabbit Magnums? Would these be classed as 'Slugs'?
     
  6. Spray1Mark

    Spray1Mark Pro Poster

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    More of a "bullet" design than slug?, tried them all, none shoot well from pellet barrels IME, they may shoot well out of a slug barrel though.
     
  7. bucketboy

    bucketboy Big Poster

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    Wishful thinking Mark!

    Bb
     
  8. Spray1Mark

    Spray1Mark Pro Poster

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    Something to test and waste time with!
     
  9. bucketboy

    bucketboy Big Poster

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    You forgot to mention “waste money on” I really struggled to understand why anyone would want an fac .177 no real advantages plenty of disadvantages.

    Bb
     
  10. Mr wolf

    Mr wolf Sad times

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    I kind of agree, would like a .22 at .177 velocity
     
  11. bucketboy

    bucketboy Big Poster

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    In fac with the right pellet you can get a .22 accurate at 1000fps it will gulp air though. TBH, if I were going the fac route, I would go with a .25 and a polygonal or fx barrel running at 925-950fps.

    Bb
     
  12. Spray1Mark

    Spray1Mark Pro Poster

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    Yes agreed the .25 is amazing, I can get 980FPS with the Impact and the 25g JSB, 880 with the 33g for around 60 shots.

    However what I am looking forward to now is shooting the .22 Redesigned Monster 25g pellet, hoping to get it near to 950FPS with a 600mm barrel.
     
  13. Spray1Mark

    Spray1Mark Pro Poster

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    Best accuraccy I find is with the .22 18g JSB at 880-900FPS.
     
  14. keithy

    keithy Posting Addict

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    I may be wrong but .177 at 900 fps is only 15 ft lb. But .22 at 900 fps is around 29 ft lb.
     
  15. Clubshot

    Clubshot Clubshot

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    Reason there are FAC Air Rifles is that some countries allow unlimited power Air Rifles. But Not to have Shell firing Rifles.
    Pax made the .177 21.g Pile Driver originally for South Africa - Which is Not Allowed to have .22
    Within weeks of going there some came back and was requested for UK Market
    My HW100 sub 12FP with lighter pellets liked them. But it was used in testing and development
    .22 FAC 30's & Pile Drivers are used often in Bench Resting Air Rifles.
    And for Hunting where there is Not a Back Stop for Shell rifles
    As most are Aware H & N purchased Pax Pellet Division several years ago
     
  16. JohnHG

    JohnHG Engaging Member

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    In South Africa we are now allowed up to 5.5 mm (.22)
    with no power restriction.
    The 5mm (.20) is the most favoured caliber here for FAC
    air rifles. I have a HW80K in .20 very accurate used for
    any PC work.
     
    Jay Butts likes this.
  17. bigal

    bigal Jedi.

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    I sat at 1040fps on 22 with 16g as ammo for years, 60shots on a non regged rapid.

    Only reason I turned it down to be tight on air. Lol. Runs at 920fps now and get 140shots on a smaller 400cc bottle. Still the pellet travels through them at 100yds etc.

    I never run 177 etc as said above, u just waste air to do the same job.
     
    bucketboy likes this.
  18. Spray1Mark

    Spray1Mark Pro Poster

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    For .177 with an 8.44g pellet correct, however as said earlier the only real way to get more power with an airgun is to go up in caliber or go up in pellet weight and maintain the speed, hence a 13g or 16g .177 JSB at 900FPS will give 23 & 29 FPE respectively.
     
  19. themadspread

    themadspread Donator

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    matt dubber has a vid on you tube.on the range on super slow mo he had to wind down his 177 to around 16 ft lbs to get the pellet to fly true.at higher power the pellet just spialed through the air and was very poor accuracy wise
     
    Chris_Brads likes this.
  20. bucketboy

    bucketboy Big Poster

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    He also does a good video on pellet vs twist rate.

    Bb
     
    themadspread likes this.

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