Wouldn't the same weight bullet/same velocity pressure curves of something like the 416 Rem vs 416 Rigby show the 416 with a higher shorter duration curve for the Rem vs a lower longer duration pressure curve for the higher volume case of the Rigby??

Is "tonnage" or cup/psi etc just suggestive of the peak pressure of each round?

Would the area under each curve be similar if the bullet velocity was the same??

I am speculating here, so somebody correct me if I'm confused---