Just build an 8# .243... coyotes will never know the difference... you'll probably never know the difference... and it's soooo much easier. I've built two 6/284s... and it just flat ain't worth it.
You want to get a little fancy... go .243 AI... it has advantages over the 6/284... like OAL length latitude... and really doesn't loose anything noteworthy in the velocity dept.