I use Benchmark for light bullets, but a whole bunch of other powders will work.

RE15 for heavies, but about anything in the RE15/Varget/4895 burn rate should work.

Schitcan the H335, it's terribly temp sensitive stuff.

Straight 223s from here on for me. The 223 AI is fine, but it doesn't gain much over the parent cartridge, doesn't feed as well, and is generally a bunch of extra expense for not much gain.