Barrel lenghts?

This is a discussion on Barrel lenghts? within the Defensive Carry Guns forums, part of the Defensive Carry Discussions category; Am I right in thinking (in general) that a semi auto's 3" barrel is about the same as a revolvers 2"? When you consider tip ...

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Thread: Barrel lenghts?

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    Distinguished Member Array ArmyCop's Avatar
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    Barrel lenghts?

    Am I right in thinking (in general) that a semi auto's 3" barrel is about the same as a revolvers 2"?
    When you consider tip of bullet to end of barrel.
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    You're on the right track. A revolver's barrel length is measured from the forcing cone to the muzzle, whereas an auto's barrel is measured from the breech face to the muzzle.

    The effect on performance can be found here: BBTI - Ballistics by the Inch :: Home
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    This I did not know. Thanks both for enlightening me.
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    I used to think that barrel length affected performance of the gun, but have found out that it aint necessarily so. Here's a gun that I built a barrel for just to see how it would work. As short as it is, it is still flawless with CCI standard rounds and even quieter than I expected.



    This one has sort of turned conventional wisdom on its head.
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    Distinguished Member Array ArmyCop's Avatar
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    Thanks gasmitty but "why"?
    Why don't they all measure / go by distance from end of projectile to where it exits the barrel?
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    Actually barrel length has a fairly big effect on the gun. Here are some reasons why:
    the longer the barrel, to a point, the more powder burn you get, which results in higher velocity.
    The barrel, depending on twist weight, pressure, and bullet weight, will affect your trajectory, muzzle velocity, and range.
    shorter barrels tend to have more muzzle flash, more felt recoil due to being lighter, and are typically also less accurate due to the shorter distance between front and rear sights.

    If you want to exaggerate a test to see the differences, use two AR platform rifles, otherwise identical, and using their iron sights. Make one an SBR with a 7" barrel, and make the other with a full 18" barrel.
    See the differences.
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    Member Array BadgerMan's Avatar
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    Quote Originally Posted by ArmyCop View Post
    Thanks gasmitty but "why"?
    Why don't they all measure / go by distance from end of projectile to where it exits the barrel?
    Probably just for ease of measuring it. With an auto it is easier to just drop a dowel down the barrel and measure from breachface to muzzle or just measure the entire length of the barrel with chamber whereas it is easy to exclude the chamber when measuring a revolver's barrel. One thing you have to take into account with a revolver is that you do lose some gas at the cylinder gap which cuts into the velocity advantage that a longer barrel would give you.

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    Quote Originally Posted by HotGuns View Post
    I used to think that barrel length affected performance of the gun, but have found out that it aint necessarily so. Here's a gun that I built a barrel for just to see how it would work. As short as it is, it is still flawless with CCI standard rounds and even quieter than I expected.



    This one has sort of turned conventional wisdom on its head.
    Nice. I would think you're not getting much muzzle energy out of it, though.

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    VIP Member Array maxwell97's Avatar
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    Quote Originally Posted by gasmitty View Post
    You're on the right track. A revolver's barrel length is measured from the forcing cone to the muzzle, whereas an auto's barrel is measured from the breech face to the muzzle.

    The effect on performance can be found here: BBTI - Ballistics by the Inch :: Home
    Good call, that's a great site.

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