Contact Johan, the senior ballistician at Accurate Powders. He's very helpful, and I'm sure will give you some reliable data on using AA5744. You won't need a filler with that powder.
+1
The Hodgdon Load Center cautions against using H4895 in a case where they don't recommend its use, and it's not listed. I would take that to mean that the case is too big. With TrailBoss, however, you can get into the 1100 fps range.
I would leave this one for the pro's.
