I would have no problem using 9mm FMJ rounds it has being doing the job for years. As for over penetration you are more likely to hit someone with the rounds you miss the target with. PS I don't think you are allowed to use expanding ammo here for self defence.
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Do we really run into these situations on a regular basis? Do we fall for the marketing hype of the super duper, rhino stopping handgun bullet?
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Makes sense to me.
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FMJ that doesn't. This gives you a much larger margin of error in the accuracy department when it comes to hitting a key component of the central nervous system
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It only gives you a couple of mm difference. The odds of having to use your firearm very low the odds of 2mm making any difference even lower. Not enough deference to concern me.