I bought 300 as well. I am pretty sure they are Federal Fusion bullets. Anyone know for sure?
From what I can find, they were originally intended for the 338 Fed Federal Fusion MSR line of ammo that has been discontinued. Don't quote me on that but I'm assuming the same as you.
There's no load data for them but it shouldn't be hard to extrapolate data from the 180 accubond / 185 GMX.