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From their press release:
I'm pretty excited to get my hands on some next year.
Read more here
4166 sounds like a great 223/5.56 powder to me. A member on ARFCOM found data already and said it looks like it's between 8208XBR and Varget in burn rate. Very similar to Hodgdon's "Extreme" line of extruded powders.IMR 4166 is the first in the series of Enduron™ propellants. It’s a perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250 Remington, 257 Roberts and dozens more.
IMR 4451 Another new Enduron powder that gives top performance in the venerable .30-06, 270 Winchester, and 300 Winchester Short Magnum, to name just a few. This propellant is ideally suited for many mid-range burn speed cartridges.
IMR 7977 is the slowest burn rate Enduron Technology powder. It is a true magnum cartridge propellant with outstanding performance in such cartridges as the .300 Winchester Magnum, 7mm Remington Magnum, .338 Lapua and more.
I'm pretty excited to get my hands on some next year.
Read more here