Hi OLE. Like Bigdaddy, I treat the two 4895's as the same powder, different lot #'s. I'd buy whichever is less $$ locally and be done with it.
The "H" version does have a little shorter grains, so, that can make a difference if you're getting short on powder room. "H" is also supposed to be a "temp-insensitive" powder, but, I've done no conclusive testing to prove or disprove it.
Steve's got some data at
http://stevespages.com/358_7_225.html which jives pretty much with what Nosler's manual says; 42 - 47 grains should do ya' (I'd start at 42 grains, if it were me <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />).
Good luck.
R-WEST