I have rounds loaded with IMR3031, CFE223,AR Comp, H335 and IMR4895 .
With the BDC reticle it help to have all the same fps. I am 2700 fps on my 75gr HPBT's and 2900 to 3200 fps on my 55gr's.
Dimitri says to go .5 moa high at 100 and all the rest of the holds to 400 will be money so that sealed it. Judging the wind at and past 400 will be the toughest with the 55gr, much better with the 75gr. I don't plan on much more than 400y round here and even that far almost always involves slope.......so it should be fun learning it