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Where does the 5R rifling come into play?

April 26, 2017play rifling

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Where does the 5R rifling come into play?

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Again our four years of testing has shown us that the land to groove ratio can cause significant variations in peak pressure created in the barrel as well as velocity obtained. As a result, we changed the land to groove ratio in the 12twist/3groove and 11/25 twist/5R buttons to reduce peak pressure, which allows us to use stiffer charges in our hand loads and obtain more velocity without increasing pressure.