How could or should the 6.5 mm Grendel be improved?

[Bill Alexander]

So the increase in envelope for this mythical rifle would not then throw you on the weight spiral upward, especially as the recoil is now increased.

I have another question. how much extra velocity, projectile weight is actually required to meet the requirement. Is another 200 fps enough. would 400 fps be better. In which case you will need a much longer casing with more volume and more pressure.