This video shows the different penetrating power of various pistol caliber and gives a useful tip for those who (claim to) work in the IT security field: when setting up a perimeter defense, the “penetrating power” of the attack should be taken into account.
In other words, there is no “one-fit-all” solution when it comes to building a digital bulletproof vest, and if somebody thinks that a fancy leather jacket might be the very same than a kevlar vest with ceramic plates, he might be wrong. Deadly, as it would be the infrastructure he claimed to protect.