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REPORT COPYRIGHT VIOLATION IN REPLY
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Message Subject
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I’m a NRA Pistol / Rifle Instructor ask me any question you like
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Poster Handle
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USMC0369 |
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Post Content
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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?  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.. Most .223 or 55.6 barrels are a 1 - 7 twist. You cant fire a 69 Gr bullet in a 1-7 twist Barrel. 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. Are you saying that you can fire a 69G in a 1-7 twist barrel? I have always been told that is a no go it will destroy the barrel and that you would need a 1-11 twist. I could be wroung.
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