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A gain-twist or progressive rifling begins with a slow twist rate that gradually increases down the bore, resulting in very little initial change in the projectile's angular momentum during the first few inches of bullet travel after it enters the throat. [27] This enables the bullet to remain essentially undisturbed and trued to the case mouth.
This revolver uses gain-twist rifling, starting with a slow twist rate of one turn in 100 in and gradually increasing up to one turn in 20 in to accommodate the combination of a heavy bullet and high pressure and velocity typical for the round. [3]
In common with the other de Bange cannons, the 155 L de Bange had a hooped steel construction with gain-twist rifling. In its original (1877) conception, the cannon required a wooden platform from which to fire. Its recoil was absorbed simply by friction with the platform, and the 155 L de Bange had to be pushed back into position after every shot.
The original 6.5×52mm barrel design, developed by the Brescia Arsenal at the same time as the cartridge before development of the M91 Carcano rifle itself, used a gain twist barrel with deep rifling to reduce wear and give consistent accuracy.
The 155 L had a hooped steel construction with gain-twist rifling. The guns had a de Bange breech and fired separate loading bagged charges and projectiles. [3] The guns sat on a Vavasseur mount with a gun shield which was bolted to a four-axle, well-base flatcar.
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The common .375 CheyTac 292 mm (1:11.5 in) rifling twist rate also has to be tightened to stabilize very long projectiles. The use of such a .375 CheyTac based cartridge demands the use of a custom or customized rifle with an appropriately cut chamber and a fast-twist bore.
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