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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. JoeHeugh

    JoeHeugh Busy Member

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    This... (nicked from a youtube video)

    Screenshot from 2019-06-12 17-15-04.png

    Here's a pellet fired at modelling clay. I know a couple of lads here have done similar things but how many hunters include this sort of thing when choosing a pellet along with chrono testing and shooting targets for the best groups? It seems to me this would be the only way to gauge the damage our chosen combination is capable of inflicting rather than follow a rough rule of thumb which seems to be medium weight diabolos for normal ranges and something a bit heavier for short range ratting. Even so I don't see many posts at all about this and I don't see people telling us they have tried a new pellet which is getting them more kills than before. I guess it's because most experienced hunters actually don't care about it very much because they know is all about accuracy and consistency over whatever ranges they choose to shoot. The cavitation and damage caused by some pellets looks impressive enough but if you hit the right spot you will kill it, if you don't, you won't. At a measly 11fpe "hunting pellets" might seem to be the way to go but they are not going to turn a bad shot into a good one or a wound into a kill.
     
  2. no country members

    no country members Tooled up tool

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    Well I'm sticking with JSB Heavy in .177 as they are much easier to pick up with my little pork sausage fingers!
     
  3. shergar

    shergar Busy Member

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    I started with JSB Heavy in .177 TX 200, but chrony results sub 12 showed them to be down on power compared to JSB Express with no better accuracy. Only with power in excess of 14 fpe did power equate to Express.
     
  4. FPoole

    FPoole Busy Member

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    The JSB Exact and the Air Arms pellets, at 8.44 gr., are accurate to around 1,000 fps. The problem is, if you are using a spring piston airgun, at these levels, the gun itself will be very hard to control. I am in the U.S., so power above 12 ft. lbs. is legal, and have had TX200's at the 900 fps level with JSB Exacts. They are just as accurate as at 800 fps. I also had a Pro Elite in .177 and it was very good at 1,050 fps, but it really required supreme concentration and technique. I have a few Field Target friends that are now shooting the 8.44 gr. JSB Exact pellet at around 950 fps with a pcp, having changed from the 10.5 gr. pellets. It takes a lot of practice to find what you and your gun likes.
     
  5. Lesley walmesley

    Lesley walmesley Nite hunter

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    I use these in my HW100 k and running @ 805 fps
     
  6. goldshooter

    goldshooter Member

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    After reading the comments, I realized I need a nitro piston break barrel that can give 680 fps muzzle velocity with a 10.5 grain pellet. That should be good enough from 30 yards.

    What model of break barrel that has that kind of power?
     
  7. robs5230

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

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    Not exactly sure how you came to that conclusion. A 10.5g pellet wouldn't be the ideal choice for a springer or a gas ram rifle at that sort of power level.

    Most European made break barrels would meet that power level, but all would perform better with a lighter pellet

    As far as I'm aware, anything producing over 500fps muzzle velocity or over 5.7ftlbs muzzle energy, in Canada, needs a firearms licence.
    If you are going the route of a licence, you have better options available
     
  8. Farty

    Farty Totty GURU

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    Is this a winde up????
     
    robs5230 likes this.
  9. goldshooter

    goldshooter Member

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    After reading the comments, I realized I need a nitro piston break barrel that can give 680 fps muzzle velocity for 10.5 grain pellet. That should be good enough from 30 yards.

    What model of break barrel that has
    I do have a license (I'm a member of a shooting club which the member can own up to 3 rifles with 12 fpe power)..... and I have my rifles imported from the US and when I take the rifle at a hunting shop (there is no firearm shop in Canada), I just have to show my license. pls understand, nobody would buy a rifle with 500 fps velocity. if they do, they buy it for kids..... even for target shooting competition in Canada, the competitors are allowed to use PCP airgun with 7.5 fpe, which translates around 640 fps with a 8.3 grain rws wadcutter.

    10.5 grain will work on newer break barrel. If you dont believe me, there is this guy on youtube (channel airgun exploration), who tried different weight of .177 pellets with a Air Arms break barrel including the JSB exact heavy 10.3 grain. what you said is true for older RWS springer....
    here is the video
     
    Last edited: Jun 13, 2019
  10. keithy

    keithy Post Whore

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    They are a great pellet for long range, they cut the wind well. But they are the worst i have found for straight thro over penetration even at 55yds.
     
  11. keithy

    keithy Post Whore

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    11.4 ft lbs not bad at all, i will have to give them a try.
     
  12. Artfull-Bodger

    Artfull-Bodger Post Whore

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    Max velocity for 12ftlbs is 826fps with 7.9 express so I set my riles to a max of 815fps
     
  13. Artfull-Bodger

    Artfull-Bodger Post Whore

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    I have been working on a set of tests for pellets recently, it's easy to measure penetration into a medium then compare the depths different pellets achieve, unfortunately this information is basically useless to us!

    To measure the effect of a pellet fired at 12ftlbs into a live quarry you need to know how much energy is being transmitted into the target, what effect this energy is having, does it perforate (pass through) and if it does how much energy is being lost with it!

    In the case of the effect, you have one realistic method of measurement and that's cavity size, so you need to fire into a non elastic medium such as clay, you can then measure the cavity size by filling the cavity with water and reading off how many ml capacity it holds, preferably using a burette or a graduated large syringe to measure, this will tell you how "hard" the pellet is hitting the target, clearly the pellets profile will play an important role here with a wadcutter or hollow point creating a larger capacity cavity at the expense of depth of penetration.

    The penetrating depth can be measured in gel, which is elastic, ballistic gel is expensive but you can buy prosthetic gel online which will suffice to compare penetrations without having to keep cutting the block up to measure.

    A grown rabbits head is roughly 35mm in width and just about any pellet has a good chance of perforating this, so it would be critical to understand how much energy the pellet still has when it exits the head, to do this you can use actual heads or a simulated gel and plastic head with a chronograph behind it, once you know the arrival energy at the range tested it's quite simple to then calculate the energy lost as the pellet passes through!

    So what your basically looking for is a pellet that causes a large cavity, that does not over penetrate, yet arrives at the target with the maximum realistic energy whilst still being consistent enough to produce good groups!

    Don't want much do we!
     

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