Not a very good story because its not really accurate. I thought the 6.8 was chosen to defeat body armor without the bulk and weight of 7.62x51. I have an opinion of the new ammunition choice and that opinion is negative.
"A spherical powder, BL-C(2) began as a military powder used in the 7.62 NATO and naturally has applications for 308 Winchester."
from the Hodgdon site
Winchester M1 Carbine, Italy lend lease, original WRA 12-42 barrel, Winchester stock, flat bolt, not sure about the rest of parts. I can't remember shooting it. I have CMP papers and some Winchester 15 rnd magazines and some ammo, and a repro case. $1850 USD