Those velocities are quite respectable from a 11.5" barrel.
And I appreciate all your testing !
Here are various my results OEM brand from a......................... 16" Middie....................... and a 20" Rifle
Black Hills 77gr 5.56 TMK .........WCC 14 ( NATO Cross )...........Av. 2636 , ES 54................Av. 2753 , ES 63..............Outstanding Accuracy.
IMI 77gr 5.56 OTM..................IMI 13 variety of 2 digits.........Av. 2726 , ES 39..................Av. 2810 , ES 41........... One of the fastest 77gr loads
FGMM 77gr .223 SMK FGMM....F C 223 REM............................Av. 2340 , ES 25................Av. 2411 , ES 33.............. Very good accuracy
PMC XTAC 77gr .223 SMK .......PMC 223 REM........................Av. 2350 , ES 62................Av. 2427 , ES 31...............
You can see ( IMHO ) Your 11.5 is doing quite well with those rounds !
Thanks for sharing !!