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External Ballistics - PNW Arms
External Ballistics deals with the behavior of a non-powered bullet after it leaves the rifling of . Many firearms ballistics tables and graphs show a rise in trajectory at distances shorter than the one (far zero) used for sight-in. . .223 in / 5.56 mm .


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Internal Ballistics
The graph below is a representative pressure curve of a typical cartridge (in this case from the M193 5.56mm cartridge using 846 ball powder). Notice how the .