These are some results Kev got, I remembered reading it on m4c.
16" M110 Carbine
Average Muzzle Velocity (of 10 Rounds) in Feet per Second (FPS) in 16” Barrel M110 Carbine:
Ammunition
Un-Suppressed
M118 LR U.S. Army
2475
Lapua 167 gr.
2465
Lapua 170 gr.
2478
Lapua 185 gr.
2265
Subsonic Lapua 200 gr.
1021
Average Muzzle Velocity (of 10 Rounds) in Feet per Second (FPS) in 16” Barrel M110 Carbine:
Suppressed
M118 LR U.S. Army
2476
Lapua 167 gr.
2485
Lapua 170 gr.
2485
Lapua 185 gr.
2282
Subsonic Lapua 200 gr.
1019
Average Muzzle Velocity (of 10 Rounds) in Feet per Second (FPS) in 20" M110 SASS
M118LR
2556
Lapua 167gr
2624
Lapua 170gr
2637
Lapua 185gr
2410
Subsonic Lapua 200gr
1028
Suppressed
M118LR
2561
Lapua 167gr
2545
Lapua 170gr
2610
Lapua 185gr
2390
Subsonic Lapua 200gr
1025