I shot five (5) rds of T762NB1 out of my 16" SCAR-17s on 08/26/2016 (so average summer weather here up north). The data:
2871.5
2867.3
2857.1
2861.2
2870.4
AVG = 2865.5; SD = 6.1; ES = 14.4
I know, small sample, but provides a good starting point. Based on an internet search, I think the G1 BC of that bullet is about .277.