About ammo for your 738, in May of 2011 a friend and I did a really informal "test" of 4 different .380 cartridges to see what happened to the bullets when going through 3 different layers of "media". We wanted to see how much expansion took place with the bullets going through 1 layer of plush carpet, 4 layers of heavy cotton, and finally a plastic bucket full of sand (I did tell you that this was informal).
We tested 102gr Remington Golden Sabers (flying at 870 fps), 90gr Hornady Critical Defense (moving along at 884 fps), Fiocchi 90 gr XTP (at 835fps), and finally good old WallyWorld 95gr Winchester Flat Nose (at 848 fps).
Unfortunately, my friend forgot to tell me (before I eagerly began searching for bullets) that the sand that he filled the bucket with was used cat litter, which made the bullet retrieval really interesting.
Anyway, here are the results of the "testing", which made me confident of my choice of self defense ammo to use in my 738.
The Golden Sabers penetrated into the KittyKrap bucket 8" with absolutely no expansion since the hollowpoint was plugged with the carpet fibers. The Fiocchi XTP hollowpoints penetrated 6" with no expansion (also because of carpet fiber plugging again). The Winchester FMJ flat points also penetrated 6" with no deformation of the bullets.
The only round that expanded from .380 to .474" was the Hornady Critical Defense, but had the least penetration (4-6"). So, for penetration through heavy clothing or excessive muscle or fat tissue, I'd use the heavier (yet fast-moving) Remington Golden Sabers or Fiocchi 90gr XTP (which moves slower, but also has excellent penetration).
In our crude tests the only round that expanded was the Hornady Critical Defense, and although some would argue not to mix ammo brands in a magazine, I stagger the Critical Defense for expansion with the Golden Saber for penetration.
Again, this "testing" was done with no (if any) degree of technical accuracy, and YMMV in your choice of ammo. Hope this helps.