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Old April 14, 2005, 08:09 PM   #1
MLC
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Join Date: October 9, 2001
Location: New Hope, PA
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223/5.56 loads simialr to M855

I have a scope cammed for the M855/SS109 trajectory.
I'd like to work up a load that will function with the scope.
What is the BC and approximate muzzle velocity of M855 ammunition?
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Old April 24, 2005, 09:09 AM   #2
dogma
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The AR15.com Ammo-Oracle:
http://www.ammo-oracle.com/body.htm#m855zero

M855: Defined in MIL-C-63989
NATO specifications for M855 Ball require a 61.7 grain (q 1.5 grains) with a hardened steel penetrator at a velocity of 3,000 fps (q 40 fps) from a 20" barrel @ 78 feet from the muzzle. Typical velocity 15 feet from the M16A2's muzzle is 3,100 fps

Its ballistic coefficient is typically 304.

Both M855 and M193 in the US generally use Olin Ball WC844 propellant. Apparently H335 is roughly equivalent to WC844.
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Old April 24, 2005, 10:12 AM   #3
MLC
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Thanks!
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