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  1. #27
    Advisory Panel Patrick Chadwick's Avatar
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    Carcano gain twist variesbetween models

    Quote Originally Posted by vintage hunter View Post
    BTW, does anyane know how the gain twist in a Carcano barrel starts out and ends up? Don't know how reliable the info I have is but it lists it as starting out at a rate of 1:19.25 at the breech end and finishing up at 1:8.25 an the muzzle and the rifling makes the same transition regardless of barrel lenght.

    For the M91: Starts at 578 mm (22.75") with a pitchangle of 2.02 degrees. Tightens linearly (i.e. there is no sudden tightening) to 201 mm (7.9", 5.8 degrees) at the muzzle, over a barrel length of 781 mm.
    For the Moschetto M91: Starts with 389 mm (15.3", 3.00 degrees) and tightens to 190 mm (7.5", 6.12 degrees), over a rifling length of only 375 mm.

    As you can see, the twist progression is NOT the same for all models, and on the Moschetto it is a fairly ferocious tightening, which is why it is not unreasonable to be worried about the jackets on oversized bullets being twisted right off the core.


    Patrick
    Last edited by Patrick Chadwick; 05-31-2012 at 02:35 AM.

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