The invention relates to the barrel of a weapon, the curve of the spiral grooves present a new. That - ci hand, at the start of the movement by a parabolic curve, bx cx and is supplemented by a constant d for which is added an exponent of which can be chosen freely. / p & & p & because of the exponent chosen freely and constituting an entry, it is possible to remove the maximum point of the tangential force, while remaining substantially at the same height, between the start of the movement and the opening of the barrel. This tangential force falls to a minimum at the mouth of the barrel.
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