I was very interested in the 6x45 and on the verge of having Wayne York rebore my Ruger 77 ultralight from .223 until I recently learned of the 6mm-204RR. The Ruger mag box is too short so I'll have to figure that out, but the 6mm-204 seems like a better round on the same platform.
In a bolt action it probably is. A no go in an ar. Also,the mag box on a ruger 77 223 is extremely simple to modify.
