Barrel Length's Effect on .45 ACP Bullet Energy

Barrel Length's Effect on .45 ACP Bullet Energy

This is a discussion on Barrel Length's Effect on .45 ACP Bullet Energy within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; I was just curious if anybody here knows a formula for figuring out how barrel length affects a round's energy (ft-lbs.). I'm interested in getting ...

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Thread: Barrel Length's Effect on .45 ACP Bullet Energy

  1. #1
    New Member Array Bear's Avatar
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    Barrel Length's Effect on .45 ACP Bullet Energy

    I was just curious if anybody here knows a formula for figuring out how barrel length affects a round's energy (ft-lbs.). I'm interested in getting Para-Ordinance's "Carry 12," that has a 3.5" barrel, and I wondered how much energy a barrel 1.5" shorter than a standard 1911's will take off a bullet?

    For instance, Double Tap has a 185gr. round that, from your standard 5" 1911, has these figures - 1225 fps, 616 ft-lbs. Does anyone know a formula I can use to estimate how a 3.5" barrel will affect both fps & ft-lbs, given this example?

    Thanks

  2. #2
    Senior Member Array Shizzlemah's Avatar
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    I can't help as to how much velocity is lost going from 5" to 3.5" barrel length, but I can contribute the formula for energy. It is dependant on velocity though.

    The formula for energy in ft-lbs is :
    ( velocity[fps] * velocity[fps] * mass[grains] ) / 450240

  3. #3
    Member Array forestranger's Avatar
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    Check thread down below for chronograph results on some loads in
    5" 1911 vs 4 1/4". Though not exact for every gun or load, I've found the old "50fps per inch" rule to be close most of time.

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    Distinguished Member Array sniper58's Avatar
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    Thanks Bear! I didn't realize this was such a hot load. I've been carrying MagTech Guardian Gold 185+P @ 540 ft/lbs. energy. I'm going to give this stuff a try.
    Tim
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    Not a mechanical engineer...but my Ultra shoots as well as my Pro...at any distance inside 15 yards...that's all I care about...I'm not really interested in deer hunting anymore...

    Stay armed...know your weapon...stay safe!
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  6. #6
    VIP Member Array crzy4guns's Avatar
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    I also use the old rule of thumb 50fps per inch of handgun barrel. Guns like Glock, H&K, and Kahr all use polygonal rifling in their barrels and therefore have a higher velocity then guns with regular cut rifling. A tighter gas seal and less friction on the bullet causes the slightly higher velocity. So I would venture a guess and say that the velocity is around 1150 fps and maybe 540 fpe. Still a very potent load for self defense.

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