Quote:
Originally Posted by WR Moore
I'm not real sure where you get that velocity range. The max average pressure of 5.56 x 45mm is slightly higher than for .223 Remington. That doesn't translate into much more than a 100-150 f/s difference in most cases, assuming equal barrel lengths. Maybe 200 f/s for some strange loads.
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I was looking at this data - which can be found here:
223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friend’s rifle – rifleshooter.com
I know we can get into various barrel lengths and bullet weights. But the bottom line point I was trying to make: In general it appears one gets slightly better velocities out of the 5.56.
