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Message Subject I’m a NRA Pistol / Rifle Instructor ask me any question you like
Poster Handle USMC0369
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Question for ya, OP... What's the ballistic coefficienteny of a 556 69 gr bullet with a 1 and 9 twist?

 Quoting: Southern Lighthouse

BC has nothing to do with the barrel twist. bullet mfr is also necessary to know the exact BC...along with the type of bullet..
 Quoting: Anonymous Coward 17785333

Most .223 or 55.6 barrels are a 1 - 7 twist. You cant fire a 69 Gr bullet in a 1-7 twist Barrel.
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