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Thread: Barrel length how is it measured?

  1. #1

    Barrel length how is it measured?

    Ok, I know this sounds silly but how is the barrel length determined. Is it the total length or is it measured from where the rifling starts?

    Alternatively if you order say a 26" barrel what do you actually get. Also how do you accurately measure it? Is it from end of muzzle to bolt face or tip of loaded round??

    Just pondering as trying to check the twist rate of several rifles.

    Regards

    D

  2. #2
    For some reason the chamber is included in the barrel length, so the easiest way is to insert a cleaning rod into the closed, empty rifle from the muzzle, mark it off at the crown and measure that.

  3. #3
    always measured from breech face

  4. #4
    No idea why, but I always measured from muzzle to front of action + 2cm for throat. The measurement agreed with the Steyr-Mannlicher barrel length given, so I took it I'd done it correctly.
    Maybe & maybe not! The fox, goat & deer never argued with the bullets fired from the rifles though.
    Blaser K95 Luxus Kipplaufbüchse .25-06Rem. Zeiss 8x56, 110gn Nosler Accubond = Game Over!

  5. #5
    Quote Originally Posted by Grandhubert View Post
    For some reason the chamber is included in the barrel length, so the easiest way is to insert a cleaning rod into the closed, empty rifle from the muzzle, mark it off at the crown and measure that.
    This is the correct method, I asked the same thing a while back via another.

  6. #6
    Barrel length how is it measured?
    As a rule ...................................... with a rule .

    I can only assume that barrel length was stated as a component part, measured before fitting to action, hence it stuck. Incidently measuring to the breech face is enshrined in US law I believe and just like the UK they have some strange laws and regulations regarding firearms.

  7. #7
    bolt face to muzzle, front of action to muzzle, blaser measure the whole length of barrel section.
    just remember to align your expectations with the chosen method of the bloke building your rifle.....and remember, you cant make it longer!

  8. #8
    Its actually measured from the "point of ignition".

    Which is usually the bolt face/firing pin, which is also the most practical way to do it.

    But for a muzzle loader its actually the flash hole, and for a pinfire or needle gun ???

    See Shotguns - for clarification.

    PS: if you are wanting to measure it to calculate twist rate like the OP, this is not the right way to do it, the unrifled part i.e. the chamber doesn't count.
    Last edited by Sharpie; 25-04-2012 at 21:53.

  9. #9
    hi , my ballistics soft ware measures barrel length from the base of the bullet to the muzzle and I guess for performance and velocity calculations that is the measurement that matters -ie how far the bullet travels inside the barrel ..

  10. #10
    Quote Originally Posted by robinz View Post
    hi , my ballistics soft ware measures barrel length from the base of the bullet to the muzzle and I guess for performance and velocity calculations that is the measurement that matters -ie how far the bullet travels inside the barrel ..
    Do you have to enter OAL/COL then?

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