separating brass which for what?

[3006mv]

Made brass from both military and commercial .223. which do you prefer to load for subsonic and transonic. was thinking of loading transonic in the military cases and subsonic in the commercial. anyone else have their preferances?

[Hoser]

For boltgun I use Lapua 223 brass that I cut down.

For AR/M-16 I just use anything. Im not shooting benchrest with it...