As you know, I'm not a big fan of the .32 ACP (7.65x17SR as the Euros call it).  I don't like the fact that it is semi-rimmed because it seems to cause feeding problems (leading to jams) in various pistols I had that were chambered for it: a Walther PP, a Walther PPK, and a Mauser HSc.

 

Hollow points in pistols present a new set of problems for guns that were designed to work with FMJ bullets.  (First requirement, the pistol MUST work reliably with FMJ or ball rounds.  If it won't work with this kind of bullet, it absolutely won't work with JHP bullets.  Key to feeding of FMJ or JHP rounds is the magazine.  Magazine lips control the round when feeding.  If magazine lips are deformed or bent, you will get jams.  IF your pistol experiences feed jams, change magazines to see if the feeding problem goes away.)  If your gun feeds FMJ round OK, but it won't feed the JHP, then it's time to consult a gunsmith.  Some of the fix is altering and polishing the feed ramp so that the pistol won't jam when the round is fed from the magazine.  There are also other tweaks that may have to be done, depending upon the pistol in question. 

 

As to reliable expansion of the JHP, this is a function of muzzle velocity and bullet design.  Muzzle velocity is greatly affected by the length of the pistol barrel.  The shorter the barrel, the less the muzzle velocity.  At some point, the muzzle velocity drops to the point that the JHP projectile cannot be counted on to expand.  Manufacturer's know this and they continually work to increase the reliability of their projectiles to operate at lowered muzzle velocities.  Nevertheless, when the MV drops below a certain point the JHP will act just like a FMJ or ball projectile regardless of its design.