Someone mentioned the universal results of plain WW metal bullets at their specified velocity. The same metal and bullets, heat treated, doesn't lose these attributes, it just requires greater velocity and pressure to act just like they did with 200-500 fps less velocity. They perform universally at that greater velocity impact level.
Yes, exactly. One can also see the same effect with heat treated alloy with a larger meplat instead of higher velocity. Balancing those three details is important.
