The Hodgdon web page list many powders for 55 gr SP and the start loafs listed should be fine for FMJ as well. They list 25.5 - 27.5 gr for Varget and, and 25.0 - 26.0 for H4895.
My best load for 55 gr bullets is 26.4 gr Varget. I worked up in .2 gr increments and Varget got more and more accurate with more powder. At 26.4 it held steady fir accuracy to 27.0 so I stopped there and use 26.4 gr as my best load.
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