H335 is my go-to for just about everything .223.

Fallbacks would be H322, Benchmark, CFE223, AA2230. I haven't tried Win 748 but I think it belongs on the to-try list. I'd stick with spherical powders unless I'd tried all of them and none worked well. Then I'd weigh trading in the gun vs cylindrical powders.

Anyone who thinks there's two sides to everything hasn't met a M�bius strip.

Here be dragons ...