i grabbed a couple matching lot bags of Sig headstamp 223 brass for mine, so it would be easy to differentiate from the rest of my stuff.
i could have swore i saw actual 6x45 pop up on starlines list at one point, but i dont see it there anymore. probably just abandoned the idea when the current shortages just continued beyond the initial start of it.
hopefully they'll add it to their list once things return somewhere closer to a semblance of "normal"
likewise with adding in 6mm arc.