Have of you guys used H4895? I have had great luck with this (as well as Varget, which sounds likes it wasn't working that great for you) with 75-77 gr bullets. It also seems to have a wider node for accuracy. It is still a stick powder though and not that great for bulk loading, however it is more temperature insensitive than TAC or AA2520.
I am surprised Varget did not deliver, one of my standby loads has always been 23.5 gr of Varget under these heavies. And one last one to consider would be RL-15.
It is hard to beat the performance per $$$ ratio of the Hornady 75 HPBT's...