When I first started reloading H335 was highly recommended for 223Rem 55gr "ball loads", but after that first batch of 200 rounds, I NEVER used it again, I would never consider firing them at night either.
I swiftly adopted Alliant RL7 for my 223 Reloading, because it is almost entirely flashless. I've got a couple pounds of H335 and I'm trying to figure out how to use it up...
Especially since I don't own a 223 Semi auto. I suppose I should try it in my long barreled (26") Varmint rig