muzzle velocities - 10.5" barrel

AR/M4 AR General Discussion
1

Has anyone calculated the muzzle velocities of various rounds out of a 10.5" barrel? I’m specifically looking for data with M193, but any 55gr round will do. There’s plenty of data for 16" barrels, but not much for the 10.5", and I think my google fu is pretty good.

Thanks!

Dave.

2

M193 out of 10.5" barrel: 2667 fps
M855 out of 10.5" barrel: 2636 fps

3

While we’re on the subject, 55 grn (M193) and 62 grn out of a true M4 14.5" barrel? Just curious. I have a LE6921 and no chronograph. My duty rounds are 62 grn Federal Tactical.

4

M4 with M855: 2885 fps
M4 with M193: 2953 fps

5

Thanks SSG!