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Sgt Lumpy, velocity and diameter are not the only factors in bullet penetration. From testing I've seen, the M193 is prone to yawing after experiencing a barrier or human/animal target. It winds up being a very poor penetrator after yawing, as it usually strikes the next thing at an odd angle and presents a much larger cross section.
Soft point and ballistic tip rounds have a good chance of expanding or disintegrating (mostly varmint rounds for the latter). Therefore, they will not overpenetrate as much as something like FMJ .308 or many FMJ handgun rounds.
None of this is to say that overpenetration is not an issue. Any round with enough oomph to stop an attacker WILL go through drywall! So, hitting your intended target and having relatively safe backgrounds are still vitally important to home defense. Training and planning are important.
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