Muzzle Velocities? 14.5" 16" 20"?

AR/M4 AR Technical Discussion
1

I tried searching for the forum and didn’t yield any specifics…

I am trying to work out dope for long(er) range shots with 5.56 and 7.62 and I am trying to find ballistics information for the different barrel lengths.

Does anyone have access to the muzzle velocities for the barrel length changes.

M855 out of 20" 16" 14.5"
M80 out of 24" 20" 16"

It doesn’t really matter for temp and altitude as I am interested in the muzzle vel difference that the length makes all else being equal…

If you have a link to a table or some such I would appreciate it.

Thanks,
Cameron

2

Just chrono’d my brand new Noveske 14.5" upper yesterday with Hornaday 75 gr TAP (I think the SAAMI version, not the NATO). Got 2475 fps with it. Didn’t have time to do any other loads.

3

while not M855 it might help https://www.m4carbine.net/showthread.php?t=6857

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5

Thanks Kevin that info is just what I am after.

Cameron