As MacKay Sagebrush says "you get the fight you get not the fight you want" fact is faster bullet speeds penetrate car doors better than slower rounds.
So a 40gr Vmax is a better at punching through car doors than say a 75gr TSX?
I see your attempt at derailing the thread, but the fact is - yes that is correct, other than the fact there is no .223 75gr TSX to compare with your 40gr Vmax. Assuming you mean the 70gr TSX though - yes, a 40gr at higher velocity will punch through thicker steel (or aluminum) plate than a slower 70-75gr bullet. That is the opposite of what they do in meat where the heavier bullet usually can penetrate better.
Same is true for 9mm. For example, a couple of my loads are a 100gr hard cast bullet at 1450 fps, and a 180gr hard cast at 900 fps. Both have similar meplat size and are cast from the same alloy. The 100gr load will punch through 1/4" aluminum plate easily and blow up a couple water jugs on the back side, while the 180 gr won't make it through the plate at all, or several layers of thinner sheet metal. On the other hand, the 180gr penetrates a long way in soft media, much further than the 100gr fast bullet.
