ballistic coefficeint for IVI 5.56 ammo ??

C77 Ball, if that's what you've got, is basically the same thing as M855. So right from the interweb : "The US Army's Ballistic Research Laboratory measured a ballistic coefficient (G7 BC) of 0.151 and form factor (G7 i) of 1.172 for the SS109/M855 ball projectile"
 
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