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Calibre debate

Discussion in 'Anything Airgun Related' started by Whistler, Jun 4, 2015.

  1. Whistler

    Whistler Donator

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    No, not .177 v .22, or .20 v the world :)

    I was just wondering if there was a theoretically "perfect" calibre for an air rifle, and not limited to what's currently available ? Something that combined air efficiency with trajectory, a calculated value that was "optimal", starting from scratch and ignoring what's currently available. So .186 cal, or .212 cal. Is there any science to be applied ?

    I woke up at 4am thinking about that :eek:
     
  2. matt goodson

    matt goodson Donator

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    Dont eat cheese before bed time, my advice.

    Seriously though, I recon a .20 pellet at 10 grain could be really nice. I emailed JSB and spoke to jurno about it, low and behold an article came out in airgun world completely ignoring where the idea came from.
     
  3. buffy vampire slayer

    buffy vampire slayer Big Poster

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    I woke up at 04:00 this morning thinking about that bird with the massive hooters on the game of war advert:D
    I`d be her hero:up:
    as many times as she wanted:cool:
     
  4. essex sniper

    essex sniper Banned

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    .177 is the perfect calibre
     
  5. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Kate upton:)
     
  6. rogersavery

    rogersavery Well-Known Member

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    "Something that combined air efficiency with trajectory"

    you can have one or the other or compromise and lose out on both

    The flatter trajectory is due to the speed of the pellet leaving the barrel (less time for gravity to make it drop)
    The air efficiency is due to the time the pellet spends in the barrel picking up energy from the air ie a slower pellet will pick up more energy as it is in the barrel for longer
     
    Last edited: Jun 4, 2015
  7. Elk hunter

    Elk hunter Keyboard Hero

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    There is no debate.

    .22 cal only because it can serve both sub 12flb and FAC over 21flb unlike the others have limits when power is added.

    Andrew
     
  8. essex sniper

    essex sniper Banned

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    I was wrong you are right
     
  9. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Thats definatly not a pair of .177's that's for sure;);)
     
  10. Ballisticboy

    Ballisticboy Busy Member

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    It will depend on what you think is optimum, the shape and weight of the pellet and the type of gun. A 3.5mm diameter solid lead slug of 8.4 grains is pretty good but needs a lot of air to launch it.Alternatively for a very flat trajectory you could try a 4.5mm low drag 4 grain pellet with as much down range energy as a normal 8 grain pellet. Perhaps for the ultimate you could try a sabot launched long rod type design of around 6 grains from a smooth bore barrel, just like a minature tank projectile, for the ultimate in energy retention and accuracy and probably a law banning them as being too lethal.
     
  11. tankman

    tankman Posting Addict

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    Airgunworld???
     
  12. Gollum

    Gollum Donator

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    At least you have the satisfaction of knowing where it came from!
     
  13. rkr

    rkr Posting Addict

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    Ballistically the perfect range for air gun pressures is in between .257 and .308. That would mean shooting bullets close to 2 calibers long at speeds just under trans sonic layer.
     
  14. gasman

    gasman Up a bit,,,,,,,

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    I like the sabo idea!
    used to love Sussex sabo's years ago lol, wonder if you could make small enough fins on a pellet/bullet?
     
  15. Ballisticboy

    Ballisticboy Busy Member

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    It is already done, they are called "Flechettes". They are basically small nails with the back end hammered into fin shapes. They are not very accurate but they are not supposed to be as you put thousands of them into a shell as anti personnel weapons. When the shell explodes they fly all over the place to cause maximum effect. Not very nice.
    [​IMG]
    Sometimes the buisiness I am in is not very nice.
    With care accurate repeatable ones could be made and as you are launching from a smooth bore accuracy should not be affected too much if they are slightly off the center line in the bore.
     
    Last edited: Jun 6, 2015
  16. Stonepark

    Stonepark Engaging Member

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    Sounds like pellet design is more important than diameter per se.
     
  17. Dr B

    Dr B Grizzly Airgunner

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    Depends what you're doing with it. For hunting, and for me, .22 all the way, but I reckon it would be even more sublime at around 14-16ft-lbs as the legal limit.
     

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