I've had the best luck so far with CFE223 with 75's loaded std and long. Have been meaning to try LVR, which is apparently just a hair slower, and is a very high-energy powder. Have heard good things about it in the 223 with the heavies. Not enough room to get enough Varget or H4895 in cases with the long bullets, and the accuracy and velocity were not as good as CFE. TAC might be another to consider, but I couldn't get the accuracy out of it.
