How could or should the 6.5 mm Grendel be improved?

[noone]

I've been messing with a case(capacity 42gr+-) that will push a 123 to around 2700fps from a 16"barrel(34gr 8208). More or less a Grendel stretched to 45mm. I'm not sure they would go for a full power round because of recoil and weight. Tony is thinking something that has a 20% weight reduction, less recoil but beats the 308 exterior ballistics.
It's wishful hoping but hey, that's how things get started.

A 6.5x45 Grendel is only 2mm short of the 6.5x47 Lapua. The 6.5x47 Lapua is pretty well established, and I'm not sure what the advantage of a 6.5x45 Grendel would be. I don't think it would fit into a AR15 sized magazine well as the bullet would have to be seated so far into the case that the case mouth would be over running the ogive. If you went to a Ar10 size rifle receiver, you might as well just go with the 6.5x47, or the 260 Remington...unless someone came up with a mid sized receiver that was between the AR15 and the AR10. If you could do that, and have the system with a "big bolt" concept, you would really be onto something.