Here are some loads that work in my son's Apex.

460 No Excuses or Bull Shop conicals with 80 to 90 grains of loose Pyrodex or 777.
200, 250 and 300 Shockwaves with 90 to 100 grains of loose powder or 120 to 130 grains of pellets.
285 Barnes with 100 grains of loose Pyrodex.

Best thing to do is choose a bullet you like for the game your hunting and then work up a powder load for best accuracy. Then, once you get a basic load worked up you can start experimenting with other bullets and powders while you have fun learning your new gun. Good luck with it.