Your data is a little biased toward the 7mmWBY.

Even with a 26" barrel you would need avery hot load to reach3200fps with a 7mmwby.My two 7mmstws only produce 3300fps with a 160gr bullet and a 26" barrel.

On the other hand,my 300ultramag produces 3380fps with a 180gr bullet and a 26" barrel.With the 168gr bullet 3500fps is easily done.The 30-378 will produce 3500fps with a 180gr bullet.If you use equally hot loads for all of the cartridges,the7mmwby no longer has any advantage.In fact it will fall behind.