First question is whether you intend to shoot these from an AR, or some sort of single shot or bolt gun? Load data, particularly powder choice, will vary between the two.
Do you have a suppressor to shoot these through?
It's also worth pointing out (you may already know) that subsonic 300 Blk is not a great hunting round, unless you choose a bullet specifically designed for subsonic use. Most commercial 30 cal rifle bullets don't do much other than pencil through at subsonic speeds.