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Does a smaller grain 223 bullet 55 grain lose accuracy with a faster twist rate 1 in 7 compared to 1 in 9 twist rate?
Wiki User
∙ 14y ago
Yes. When the 55 grain M193 cartridge was introduced, it was originally intended to be used in a 1 in 14 pitch barrel, but this was later changed to 1 in 12. 1 in 9 will still get satisfactory results with 55 (and lighter) grain 5.56 and .223 cartridges, and is actually the ideal pitch for the 62 grain NATO (SS109 and M855) cartridges. However, the military went with a 1 in 7 pitch, because it could achieve matching flight characteristics from both the 62 grain FMJ rounds and the 64 grain tracer cartridges.
The most dynamic rate of pitch is 1 in 8, which is capable of stablising everything from the 55 grain cartridges, up to the 80 grain .223 Wylde cartridges.
Wiki User
∙ 14y ago
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