I haven't tried BLC2 in the 9.3x62, but Hodgdon lists it with the 270 Speer. Looks pretty impressive: 66.0 grains gets 2548 fps at 47,400 CUP. This is considerably more velocity than any other 270-grain bullet load listed.
I'd drop that a couple of grains for any 286, but it looks like it might work very well.
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