GAIN TWIST SYSTEM OF RIFLING
GAIN TWIST SYSTEM OF RIFLING—About fifty years ago there was a strong leaning toward the gain twist system of rifling for gun barrels. What was the theory and advantage, if any?
If I am not mistaken the gain twist was designed to give the bullet a higher speed of rotation and at the same time render it less likely to jump or strip the rifling. When the barrel had an even twist its entire length, if the pitch was rather sharp the first shock of the explosion would cause the round ball to jump the rifling, if a heavy charge of powder was used. I do not think that the gain system was much of a success and it was difficult to rifle a barrel in this way.
Harding, A.R.. 3001 Questions and Answers. Columbus, Oh: A.R. Harding, 1913.
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