We cannot offer the Coyote in 223 head size rounds as we do not have a suitable magazine for it. We make all of our own magazines for Coyote and Timberwolf (a shocking revelation to some I know) and we currently cannot justify setting up to make these based on qty we could sell. For the most part we only produce 308, 338 Lapua and 50 BMG. The occasional 260 or 300 Win Mag goes out of here along with some other non-standard stuff but it is pretty rare. If it will not function in our existing magazines we cannot justify doing it.
Single shot stuff is a different story however we have never done a 223 head size in a single shot either...
So a 243 is possible ???