How could or should the 6.5 mm Grendel be improved?

[Bill Alexander]

In favor of what?

I am not exactly sure at present. The result will stem from the target definition and the hit probability ie the required carried kills.

Gut says maybe a 6.5 but i would prefer a 7. Keep the OAL short and then work back to the case volume for the optimum operating pressure at an acceptable fill level with the new powders.

Grendel in the legacy M4 runs at too low a pressure to best utilize the case. I would want to push this up. The technology for this is simple and the bolt/barrel extension geometry is not a problem. The extension/barrel interface might need some massaging to hold up at elevated temps. In a new rifle this is easy stuff and the weight spiral is non existent as long as the mag length is constrained.