Understanding the physics of ammo

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  1. #1
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    Understanding the physics of ammo

    I am just getting into ammo, and in reading the charts i am trying to draw a conclusion about velocity vs weight. I am noticing that as the bullet grain increases the velocity drops. Simplely understood weight and energy to move it.

    BUT.


    What is better higher velocity getting to the target faster.

    OR

    a greater weight inpacting the target slower.....


    a i understanding this correctly?


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  3. #2
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    That is going to depend on the design/makeup of the bullet. Some are designed to get to the target as fast as possible for greater penetration, and some are designed to be a little slower, but carry a bigger punch. It is like deciding if you would rather be hit by a Lamborghini going 150 mph, or a semi-truck at 50. They are both going to get the job done, just in different ways.

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    Which effects accuracy the most?

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    Senior Member KIRK'S AWAY TEAM (blue shirt) rd_zzyzx's Avatar
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    Quote Originally Posted by achilliz View Post
    Which effects accuracy the most?
    Consider accuracy versus precision:

    Accurate


    Precise



    Either bullet can be accurate and precise. It depends on the specific load tuned to the barrel/gun.

    Bullet drop will be the major difference. Velocity affects time of flight. The longer time flying the more time to drop. Weight does not effect drop.
    The Ballistic Coefficient effects how efficiently it travels through air and therefore the time of flight.

    RD

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    Quote Originally Posted by achilliz View Post
    Which effects accuracy the most?
    The shooter.
    "We hang the petty thieves and appoint the great ones to public office." - Aesop

  7. #6
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    Quote Originally Posted by achilliz View Post
    Which effects accuracy the most?
    Speed and weight does not effect accuracy or precision if everything remains constant. Typically a heavier bullet will have a lower point of impact for a given distance and a constant powder charge because it will be moving slower than a lighter bullet. If you are loading your own ammunition, you may be able to increase the powder charge to get a higher velocity even with a heavier bullet. There is a limit to this method, and if loaded to max pressure, the lighter bullet is going to be faster, and will have a higher point of impact compared to a slower heavy bullet. This does not effect precision as long as you are consistent with powder charge and bullet type/weight. You may have to adjust point of aim to get similar points of impact, but if shooting for precision, consistency is key. There are some bullet/powder combinations that work better with individual guns (barrel length and twist rate play a large factor here along with bore condition on the gun) and that is one reason why people like to load their own ammunition. You can find what works best for your gun, and consistently reproduce that round.

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