I had not researched this any before this morning. Interesting cartridge design - 3 piece case to reduce weight and handles 80,000 psi operation propelling 140 grains @ 3,000 ft/s out of a 16" barrel!
For anyone interested, there’s pretty good initial ballistics comparisons on this link:
.277 Fury (6.8x51): Details, Ballistics, & Is the M4 Dead? (bearcreekarsenal.com)