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Message Subject I’m a NRA Pistol / Rifle Instructor ask me any question you like
Poster Handle AdHocBOHICA
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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?

hf
 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.
 Quoting: USMC0369



69 gr Federal SMK work VERY well from all 1/9 twist COLT barrels in the early 1990's....Military HiPower Comp.
YES YOU CAN........Back up just a bit. 55 gr is fine in most 1/7 twist 16" or shorter guns....MOST......depends on bullet construction. I know my Guns. Wrong.
 
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