Now that I have Gun Stats instead of what Douglas Cole developed for damage and I kludged for range...
More information about the rounds themselves has come to light as well.
Oh, and if you have $2500 laying around you can just BUY XM1168 ammo from SIG in 920 round crates. Use the M250 damage and range stats for firing from your MCX Spear.
Gun Stats doesn't offer the +P Extra Powerful modification to the rounds because you enter the performance directly, but I kept the 1.5 cost modifier from High Tech.
Commercial 135gr loads from a 16" barrel:
.277 Fury 6d+2 pi, 1,190/5,000. G$1, 0.043 lb. per round.
.277 Fury Match 6d+2 pi, 1,190/5,000, +1 to Acc. G$1.25 per round.
.277 Fury Match HP 6d+2(0.5) pi+, 1,190/5,000, +1 to Acc. G$1.25 round.
.277 Fury Hybrid Match +P 7d+1 pi, 1,300/5,500, +1 to Acc. G$1.88 per round.
.277 Fury Hybrid Match HP +P 7d+1(0.5) pi+, 1,300/5,500, +1 to Acc. G$1.88 round.
In the M7 rifle you get:
6.8x51mm XM1168 AP 4d+2(2) pi-, 970/4,100. G$2.25 per round.
6.8x51mm XM1184 APHC Match 6d+2(2) pi-, 970/4,100, +1 to Acc. G$3.75 per round.
6.8x51mm XM1186 AP Match 4d+2(2) pi-, 970/4,100. +1 to Acc. G$2.81 per round.
6.8x51mm XM1188 Reduced Range AP 4d+1(2) pi-, 880/3,700. G$1.5 per
round.
In the M250 LMG you get:
6.8x51mm XM1168 AP 5d(2) pi-, 1,040/4,400. G$2.25 per round.
6.8x51mm XM1184 APHC Match 7d(2) pi-, 1,040/4,400. +1 to Acc. G$3.75 per round.
6.8x51mm XM1186 AP Match 5d(2) pi-, 1,040/4,400. +1 to Acc G$2.81 per round.
6.8x51mm XM1188 Reduced Range AP 4d+1(2) pi-, 930/3,900. G$1.5 per
round.
These rounds appear to have been abandoned, but I've included updated stats for the M7 anyways.
6.8x51mm XM1169 AP Match 4d+2(2) pi-, 970/4,100. +1 to Acc. G$2.81 per round.
6.8x51mm XM1170 APHC 6d+2(2) pi-, 970/4,100. G$3 per round.
6.8x51mm XM1184A1 APDU 8d(2) pi- inc, 970/4,100. G$3.83 per round.
6.8x51mm Aeroshell SLAP APDS 10d(2) pi-, 1,460/6,150. G$4.50 per round.
6.8x51mm HAPI API AP Incendiary 4d+2(2) pi- inc, 970/4,100. G$2.50 per round.
6.8x51mm NM142 HEIAP: APHEX Incendiary 4d+2(2) pi- inc follow-up 1d-3 cr ex, 970/4,100. G$5.25 per round.
6d+2 pi will do an average of 23 points of damage. This will almost penetrate NIJ III armor.
4d+2(2) pi- will do an average of 16 points of damage. This will almost penetrate NIJ IV armor.
5d(2) pi- will do an average of 17.5 points of damage. This is the damage that NIJ IV is designed to stop and it stops it exactly!
6d+2(2) pi- will do an average of 23 points of damage and handily penetrates NIJ IV armor with 6 penetrating for 3 points of damage to the target.
7d(2) pi- will do an average of 24.5 points of damage and handily penetrates NIJ IV armor with 7.5 penetrating for 3 points of damage to the target. Rounding sucks!