One, and a fairly firm command of it.And how many Languages have You?
Just how many shootings have you personally investigated?This "Failure to Penetrate having Arm struck" seems stuff of fevered imagination.
I'll say it again - penetration is paramount in defensive ammunition. You may have to shoot through a raised arm (6" or so), or shoot a heavily clothed, fat, or muscled person. Then you've got a good 6" (or more, depending on the angle) from impact to the good stuff (major arteries, heart, and best of all the spine, but you need extra oomph to punch through the armor). 12" is a minimum level of penetration for serious defensive use - I want more.
With this specific gun using Silvertips there was no issue of rimlock (that I am aware of). Would you still recommend FMJ's?
Yep. If by some miracle the Silvertip actually expands you won't get adequate penetration. In this case, ball is cheaper and better.
The .32 is a neat backup or deep concealment round, with a P32 or Seecamp, but it isn't really a fighting cartridge.
The .380 has become the red-headed stepchild of defense cartridges with the advent of 9mm pistols the same size and weight of the .380's. Unless you're just in love with the gun (Mustang Pocketlite, anyone?) I'd recommend a PM9 or 642 for backup/deep concealment use.