It's a thought I have and one I'll have to think more on, but I'd seriously like to know how often has someone has had to shoot someone in self defense thru their side which meant they had to shoot thru the attackers arm.
The two cases where I can see that not happening is if the attacker is lunging at the victim with his arms out or where the victim is on the ground having been knocked over and has to shoot up, in which the bullet may have to go thru the attackers pelvis.
In the event of those situations, solid .32 ACP bullets like FMJ or the Lehigh are more than capable of going 12 inches deep in gel. For everything else a JHP would work fine, but the issue with .32 ACP and short barrels is the hollow points don't expand.
If the attacker is holding a weapon, or is reaching, to his front, a defender’s bullets may encounter arms and hands, or even strike the weapon. Two of my LE colleagues, personally known to me, were hit in their arms and/or hands. (I hope that I comprehended your post correctly; my brain is a bit foggy with fatigue, as I am trying to monitor things, in this big, nasty winter storm.)
The FBI shootout, in southern FL, with Platt and Mattix, resulted in multiple agents being hit in the arms and/or hands. Of course, Platt took that infamous hit, through his upper arm, into his torso, though that was fired from flanking direction, by Agent Dove. Arm and hand hits are happening, often, if one pays attention to the incidents. The FBI incident is an example that is easily searched, on the internet. While it was an LE incident, we could factor-out who was “good” or “bad,” and flip it to a case of two guys “defending” themselves against “road ragers,” or hijackers, and, we can also break it down into individual contests between specifics aggressors and defenders.
One thing to keep in mind, for a case of being on the ground, and having to fire upward, is that a large belly may well be in the bullet path leading directly to the organs in the upper torso.
I bought some of those Lehigh .32 ACP loads, but have yet to try them in live fire. I would like to read of what others may have experienced, before trying them in a Seecamp LWS-32. I had been casually trying to find a nice Beretta, or similar, .32 pistol, which suddenly became not so easy, when the panic-demic started.