Check out the older Alliant load data because they have loads like that using 2400. The .222 loads are closer to what you want than the .223 loads but 2400 loads down just fine anyway.
Okay, I just found some 2400 loads in the Alliant 2001 manual. But I am confused; how does the Silhouette load use 15.9grs of 2400 to get 2,430 fps while the regular load uses 14.0grs to get 2,685fps?
(both loads uses a 55 grain bullet)