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Question Which One Is Better? Higher Velocity Or Heavier Pellet?

Discussion in 'Anything Airgun Related' started by goldshooter, Jun 12, 2019.

  1. goldshooter

    goldshooter Member

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    For medium range hunting (up to 30 yards), which one is better a higher velocity pellet or a heavier pellet?

    for example, you can use Gamo lethal .177 pellet (the weight is about 5.8 grain) and achieves about 1000 fps using a break barrel rifle. or using a heavier pellet such as Gamo Rocket (9.6 grain) and get about 800 fps. Which one is more lethal from 30 yards?

    PS: gamo lethal is made of plastic with brass tip and the pellet is longer than most lead pellets.
     
  2. That hurts

    That hurts Barely Active

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    Don't know where you are based or if you are a FAC holder, but both of the figures you quote are over 12 ftlb, so you are potentially running an illegal set up.
     
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  3. milek

    milek Honorary Member

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    Whichever is the most accurate
     
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  4. goldshooter

    goldshooter Member

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    those are not real numbers. only for you to understand my question. BTW I have a 9.5 fpe break barrel.
     
  5. robs5230

    robs5230 If it's a springer, it will be oversprung

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    The figures you're quoting (if you're in the uk) sound like manufacturers claims.
    Seems like its a Gamo rifle and they are Gamo's recommendations on pellet choices.

    Velocity is key to a point in my opinion but in .177 I reckon the max velocity you'd want shouldn't exceed 850fps (regardless of weight).

    I wouldn't use either of those pellets.

    But, the most lethal pellet is the one with which you can consistently deliver a shot on point of aim.
     
  6. robs5230

    robs5230 If it's a springer, it will be oversprung

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    I use 7.87 pellets at around 787 fps which I feel give me the best possible combination of flat trajectory and energy transfer. This translates to very instantaneous kills for me.
     
  7. Tim_B

    Tim_B Very Active

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    I'll take accuracy over anything else.
     
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  8. carnivore

    carnivore Big Poster

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    The smaller pellet travelling very fast risks overpenetration, not a problem if you hit the brain but a miss could pass through without much effect and your target gets away wounded. The larger is likely to have a shock effect which even in a poorly placed shot could stun/shock your quarry down for you to quickly approach and finish.
    As has been said, the most accurate is the most potent.
     
  9. goldshooter

    goldshooter Member

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    You guys talk about accuracy is the king. is there a specific range of velocity that makes a pellet more accurate?
     
  10. TonyB55

    TonyB55 Engaging Member

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    You need around 4ftlbs to kill a rabbit. Accuracy is the key, a 6ftlb rifle will be lethal if the shot placement is correct. Why all this focus on power?
     
  11. robs5230

    robs5230 If it's a springer, it will be oversprung

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    There will be a point at which even a very quick moving pellet will not over penetrate.
    Obviously dependent on the quarry type / mass / construction, pellet design and weight.
    Getting that balance right is key to make the most of energy transfer into the target.
     
  12. robs5230

    robs5230 If it's a springer, it will be oversprung

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    I'd say no but there would be a velocity at which stability would effect accuracy. Pellet design would also have an impact on that limit.

    I've shot a 6ftlb target rifle out to 50 yards with very good accuracy. That was about 600 fps with a 7.87g diablo pellet.
    I run my springers at around 10.5ftlbs with a 7.87 pellet with very good effect in the field.
    There will be a point at around 850-900 FPS that even a well designed .177 diablo pellet becomes unstable in flight and hence inaccurate.

    The reality is that any calibre makes an effecting hunting pellet. Most choose one over another.
    There are advantages and disadvantages in all of them.
    Smaller calibre - lighter weight but flatter trajectory, less air time to target
    Larger calibre - increased weight but loopier trajectory and slower to get to target.
     
  13. thumbhole

    thumbhole Post Whore

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    Make sure you can shoot accurately, before you worry about pellet speed and weight, because if you can not hit a barn door your wasting your time. 5p groups at 30 yards is more important than pellet speed, forget anything with penetrator, or lethal in the title a good domed head from the likes of AA or JSB in any weight is Lethal in any thing I hunt with. Focus on your skill to group consistently with a good pellet. Welcome to the Forum power questions with so little posts don't do very well. :thumb:
     
  14. RagnarHairybreeks

    RagnarHairybreeks Keyboard Hero

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    Work done by a projectile (ie energy dumped into the target) is calculated as 1/2 mass times velocity squared, so velocity has a significantly disproportionate affect compared to mass which only affects the total linearly.

    However force = mass times acceleration (or in this case deceleration), f=m(dv/dt) so you need the pellet to stop very hard. Think about how much more it hurts if you walk into a lamp post than fall onto a bed. A small and very fast projectile is liable to zip straight through whatever you are trying to move to the next life taking most of its energy with it. A big, slow moving projectile tends to stop more quickly so dumping its energy like your face into that lamp post.

    However a faster projectile will have a flatter trajectory making it far more forgiving over range and so, in the hands of a typical shooter, more likely to land exactly where you want it to. When hunting, a shot through the cranium is pretty much always instantly fatal on all legal prey species.

    However unless you are carrying an fac you have to fit all of the above inside of 12 ft/lb.

    So. Not a simple question to answer.

    I am however fairly sure that you are shilling for Gamo pellets (which I wouldn't touch with a really long one) so you probably aren't interested in my answer anyway.
     
    hamza likes this.
  15. RichieRich

    RichieRich Kozak Advocate

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    Velocity does not make a pellet more accurate, so ignore the marketing figures. Only the pellet and the barrel has any bearing on how accurate it is.

    Some gun barrels will like a particular variety of pellet, and others won't.

    The key to accuracy is testing various types of pellets from different brands until you find the right one that gives you the tightest grouping and consistent results every time. This is your preferred pellet.

    See if you can get hold of a few tester packs and record your results :thumb:
     
  16. robs5230

    robs5230 If it's a springer, it will be oversprung

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    Interested in those calculations but not very arithmetical.
    Could you give an example of a 7.87 and an 8.44 both travelling at 787fps and explain the results ?
    Cheers
     
    RagnarHairybreeks likes this.
  17. shergar

    shergar Busy Member

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    Irrespective of weight some pellets leave the rifle with more energy than others. Find a range of pellets that allow gun to produce at least 90% of its potential and from that range choose the ones that group best
     
  18. shergar

    shergar Busy Member

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    Divide velocity, 787, by 671 equals 1.173 square this number equals 1.375 multiply this by weight of pellet in grains gives energy in fpe.
    In above case 10.8 and 11.6
    671 is the figure to remember this works with all velocity and weight of pellet and is a simple calculation.
     
    Last edited: Jun 12, 2019
    RagnarHairybreeks likes this.
  19. goldshooter

    goldshooter Member

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    I've heard if a pellet goes above 900 fps especially the smaller ones (such as RWS superdome or JSB exact), it becomes unstable and thus making it inaccurate....is that true?

    BTW, I have liked RWS superpoint to shoot small games.
     
  20. rich79

    rich79 Donator

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    A rabbits brain won't argue over a few ft/s.
     
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