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Thread: 243 twist

  1. #1

    243 twist

    Hi I have a cz brono 243 and would like to know what twist it has. and what is the recomended bullet weight for the rifle? I shoot a 58g norma on long range foxes and 100g on deer and none have ran on yet. can any one help thanks.

  2. #2
    It is not hard to measure the twist rate yourself, just use a cleaning rod with a brush/mop attached. Mark the rod near the handle with a small line, push the rod into the breech until the brush engages the rifling, then mark the rod again at the point where it is up against the back of the action or the end of a bore guide if you are using one, this is your first datum point..

    Then as you push the rod watching the first mark, when this has completed a full rotation stop pushing the rod and mark it at the point where you made the first datum mark.

    Withdraw the rod and measure the distance between the two datum marks, say that is 10 inches, you then know you have a 1 in 10 twist barrel.

    Hope that makes sense.

  3. #3
    Whatever your twist rate turns out to be, remember that it relates as well to the length of bullet it can stabilise. That in turn will lead you onto bullet weight.

    Have a look at this -

    In particular Greenhill's formula. This led me to adopt a 87gr bullet in my 1:9 243.

    Also this might be useful.

  4. #4
    Its either a happy accident or Sanders is experiencing some sort of ESP.... I have the same rifle, (assuming its a 550) and it has a 1:10 twist!

  5. #5
    i found this on the net and thought it might be of use


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