6.8x51mm GURPS

According to the Douglas Cole equations...

13" barrel XM5:

135gr 6.8 bullet at 2,850 does 7d pi.  Vehicles says that's 500/3,200 for range.

16" barrel XM250:

135gr 6.8 bullet at 3,000 does 7d+2 pi, same 500/3,200 for range.

3e Vehicles is known to have faulty range numbers...  Edit: Mr Cole himself says 700/5,000.

The M250 is the winning part of this tender.

12 lb. for the bare gun plus the optic and suppressor is 15.4 lb.  Add a 100 round belt for 5.3 lb. and you have a very manageable 20.7 lb. package.  26 lb. with 200 rounds.  This is an actual improvement for the grunt having to lug an M249 or M240B!

The M249 is 22.6 for the gun, no optics and 7 lb. for 200 rounds of linked ammo.  29.6 lb.  Add

The M240B is 34.2 lb. for the gun and 6.6 lb. for 100 rounds totalling 40.8 lb.!  Add 2.8 lb. for the Trijicon optic.

I am wondering if the real goal of SIG is to get the 6.8x51mm in the supply chain then offer their MCX in 5.56 that the XM5 is a very close relative of when the back breaking nature of the M5 becomes apparent.