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Old 06-07-2010, 14:15   #1
bwh21
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Stupid question time

I was checking into AR-15 ammo, specifically .223, and I noticed that an overwhelmingly high percentage is between 50 and 60 gr. Other rifles have much ammo weighing 4 times that much and even 9mm is over 125 gr. What's the deal with such a light bullet with the ARs?

I don't know much about ammo, so my only guess is that a projectile that light can be thrown much faster, but that is only a guess.
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Old 06-07-2010, 16:29   #2
triggerjerk
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Smaller projectile= higher velocity potential.

Plus most AR barrels have rifling twist rates that suit 55-69gr bullets.
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Old 06-07-2010, 17:42   #3
cowboy1964
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Yep, velocity. Around 3000 fps. By comparison your typical 7.62x39 (AK-47) round is around 2100-2300 fps (but it weighs 120-150gr).

Last edited by cowboy1964; 06-07-2010 at 17:42..
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Old 06-07-2010, 19:23   #4
Kalmah
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Everything you could possibly want to know about .223/5.56 ammo.
http://ammo.ar15.com/ammo/
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