Hornady 6.8MM SPC 110 BTHP TAP:

Gelatin Results:
Bare Gelatin: 110 gr TAP 2540 fps 16" bbl. (side)
Total Pen. 16.75", Max. Cav. 6.5"
Depth to Max. Cav. 5.75", Entry .5"
Retained weight: 73 gr.

Hornady 6.8 SPC 110 TAP URBAN® (V-MAX):

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Gelatin Results:
Bare Gelatin: 110 gr TAP 2443 fps 16" bbl. (side)
Total Pen. 15", Max. Cav. 6.50"
Depth to Max. Cav. 5.25", Entry .5"
Retained weight: 69 gr.

SSA Barnes 85 Gr. TSX:

Gelatin Results:
Total Penetration: 17.5"/16.5"

Barnes 110 Gr. TSX:

Gelatin Results:
Total Penetration: 22"

Sierra 110 Gr. Pro-Hunters:

Gelatin Results:
Firearm : Gas-operated semi-automatic with 20.0" barrel length and 1/10" twist
Cartridge : Handloaded 110gr Sierra Pro-Hunter soft-point
Block calibration : All depths corrected (actual BB penetration was 13.0cm at 595 ft/sec)
Single shot fired at 15 yards distance, impacted the block at 2466 ft/sec and penetrated to 12.5". Average recovered diameter was 0.551" and recovered weight was 77.0gr.

Sierra 115 Gr. SMK:

Gelatin Results:
Total Penetration: 14"

Nosler 110 Gr. Accubond:

Gelatin Results:
Muzzle Vel: 2589 FPS.
Distance: 100 yard.
Weight retention: 86.3 grains.
Bullet expansion: .525 dia.

Remington 115 gr FMJ:

Gelatin Results:
vel=2436 fps from a 16" 1/11
BG: pen=15"+
NL=7cm
Max TC diam=14cm@18cm from 7-32cm
RD=0.40x0.15” (bullet flattened)
RL=1.09”
RW=96.3gr

Speer 90 gr TNT JHP:

Gelatin Results:
vel=2610 fps from a 16" 1/11
BG: 13.8"+
NL=4.5cm
Max TC=13cm@13.5cm from 4.5-24cm
RD=NR
RL=NR
RW=NR

From DocGKR posted on M4Carbine.net:

6.8 mm Hornady 110 gr OTM, vel=2613 fps from a 16” 1/11
BG: pen=17.7”, NL=3.5cm, Max TC diam=11.5cm@11.5cm from 3.5-20cm, RD=0.50”, RL=0.37", RW=80.0gr
Glass: pen=14.0", NL=0.5cm, Max TC diam=13cm@14cm from 0.5-24cm, RD=0.32", RL=0.51", RW=74.5gr

6.8 mm SSA 115 gr OTM (SMK), vel= 2520 fps from a 16" 1/11
BG: pen=15.0”, NL=5cm, MAX TC diam=11.5cm@15cm from 5-28cm, RD=0.49”, RL=0.26", RW=53.5gr
Glass: pen=12.8", NL=0.5cm, Max TC diam=9.5cm@11cm from 0.5-19cm; RD=0.48", RL=0.20", RW=32.7gr

While both the Hornady 110 gr OTM and SSA 115 gr SMK OTM offer acceptable terminal performance, the Hornady projectile is more consistent.