Here is a comprehensive velocity test of many 5.56/223 commercial ammo types, in 10.5, 11.5, 12.5, and 14.5 barrels.

It is a little bit of a nut-roll to go through, but the links at the end of the first post have the 10.5" velocity data.

https://www.ar15.com/forums/AR-15/S...-11-5-12-5-and-14-5-ALL-DONE-/16-714088/