As for ammo, I have the little Bersa mags (3 of 'em) loaded with Hornady Critical Defense rounds. Each mag holds 8.
Bzbadger, I also have a little Walther PPK/S in .22LR caliber. The mags, 3 of them, hold 10 rounds each. I feel that I can put all 10 from a mag into a 12 inch circle as fast as I can pull the trigger. The little Bersa has some recoil and I can't fire into a 12 inch circle as fast because after each round, I have to get it back on target.
I had the little Walther out a couple weeks ago. I fired 60 or 70 rounds through it, just shooting at paper. Then I fired 40 rounds through it as fast as I could pull the trigger. With each mag-full, I had at least 9 of them inside a 10 inch circle at about 18 feet. The little gun is so easy to hold on target, just point and shoot. On the second mag load, the 4th or 5th was a FTF. I cocked the hammer and tried it again, still no fire, then on the third try, it still wouldn't fire. Just a bad primer evidently. I was shooting CCI copper coated hollow-point target rounds. If I ever decide to use the gun for carry, I'll probably use the CCI mini mags or stingers. I don't remember the specs on these, but which ever I feel is the most lethal.
The Walther .22 and the Bersa .380 are almost the same size. They fit the front pocket or back pocket of my pants, or my coat pocket easily. Also I bought a shoulder holster, but haven't got around to adjusting it to the way I want it to fit yet. Either gun will fit it nicely. I haven't found a inside or outside waist holster yet that I like.