I've lately messed with .218 Bee, .300 Blackout, and 7.62x39 - which all take similar, fairly new powders.
Lil'Gun, 300MP, and 1680 are all suitable for these rounds. And Hodgdon just announced a new CFE-BLK. It's intended for the .300 Blackout, but also is in this same burn rate range, and may be interesting in the .450.
