They are building them for "Power Factor for NRL Hunter class" the 6mm can't make the minimum power factor. So far that is about the only reason I can find for the round. The 6.5 makes a better medium game round and the 6mm a good predator/varmint round. I'm a .25 cal fan having owned a couple 250-3000's, 257 Roberts, a 25-35 and my own 25-204. I looked at the 25 Souper(25-08) and the 25-284 in the past and there just wasn't enough there to justify a build. The 25 Creedmor is basically a 250-3000AI and has been around a very long time, in fact since Ackley built the first one and it hasn't done a hill of beans until someone changed the name and added Creedmor and now it is fashionable, and someone found a knitch for it.