Well, it was my impression that you started with the premise that the bullets were the same diameter and energy at impact. Then you calculated that they would penetrate to the same depth. Not taking into account the greater vibration, sound, and shock wave that would result from the impact of the faster lighter projectile. Why would I have gotten that idea? Oh, I dunno:It was a premise in my calculation that the two bullets had the same penetration depth. That was the starting point for my calculation not the conclusion.
... my bold and italics.I think you are referring my post #139 with its attached calculation. In my (highly idealized) calculation, two bullets of the same cross-sectional area and same impact energy were found to penetrate to the same depth.
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