Pennsylvania Firearm Owners Association
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  1. #1
    Join Date
    Feb 2008
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    Patton, Pennsylvania
    (Cambria County)
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    Default Bullet drop at 100 vs FPS at barrel

    I have a question i am hoping someone can answer.

    How can i tell how much of a difference at 100yds there will be changing the speed at barrel?

    For instance 223 at 3200fps hits right on, if i was to drop the fps to say 2800fps same bullet, how much lower would it be without changing scope?

    I have a savage model 24 that i would like to get the shotgun barrel and rifle barrel a little closer to being the same, right now the rifle at 90yds is 1/2 high, but the shotgun at 40yds is about 7inches low. I was hoping i could load down some 223 to get that closer, but i dont want to waste time if it wont work.

  2. #2
    Join Date
    Mar 2007
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    Langhorne, Pennsylvania
    (Bucks County)
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    Default Re: Bullet drop at 100 vs FPS at barrel

    You are not specifing any bullet weight so let us use 55gr as the choice.
    All things being equal at 3200 FPS and a zero at 100 yards bullets drop at 200 yards would be 3".
    At 2800 FPS with the same zero bullet drop is 4.4" at 200 yards.
    With those figures I don't think it would really matter much.

    Jeff
    NRA Benefactor member
    NRA 2nd Amendment Foundation
    Colt Collectors Association
    Browning Collectors Association
    Sharps Arms Collectors Association
    SASS Association

    SANS PEUR et SANS REPROACHE

  3. #3
    Join Date
    Feb 2008
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    Default Re: Bullet drop at 100 vs FPS at barrel

    I was thinking the same thing. I am guessing even if i loaded down to about 2800 it may drop 1 inch or so, and that aint worth messing with.

  4. #4
    Join Date
    Feb 2007
    Location
    Apolacon Township, Pennsylvania
    (Susquehanna County)
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    Default Re: Bullet drop at 100 vs FPS at barrel

    There's a boat load of free to use ballistics calculators on the web. Just do a simple search, you'll find then put in your variable and get the answers.


    "Those who can make you believe absurdities can make you commit atrocities".

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