[snuffy smiff]

I'd be very interested in the chrony results of that test.

finally it seems the Army is waking up to the fact that them pea-shooters just ain't gettin' 'er done!(found at mausercentral):

http://www.freerepublic.com/focus/f-news/1430038/posts

[yarddog]

I don't know what the velocities are for those particular rifle/loads, but I have since learned that the SS109 load for the little .223 will out penetrate the .308 at long ranges pretty much consistently.

The reason is the ballistic perormance of that bullet is great at longer ranges.

I am sure the .308 develops more energy at any reasonable range although at some point that SS109 would probably overtake it.

The problem with those M4's (I think that is what they are called) is the short barrels which really lower the velocity and energy of the .223.