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At least where 71 gr. FMJ bullets are concerned I am skeptical of the answer. In the attached photo, the three bullets on the left were fired through a mid 60's Detroit steel station wagon tailgate (2 or 3 layers of steel depending on where it hit) and were found in the Mojave Desert rock sand mix behind it. The most deformed one hit a substantial rock after penetrating the tailgate. The right most bullet was fired into wet newspaper for a penetration test. The three left bullets are Winchester, the right most is Fiocchi 71 gr. FMJ 32 ACP.s.
I have a hard time believing that the launch would be violent enough to distort the bullet enough to cause forcing cone damage. If we were talking about a 60 gr. HP that has a thinner jacket I would be more inclined to agree.
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