A 147gr HP is fine for a full sized 9mm pistol with a 4" to 5" barrel but in a short barrel 9mm it looses a lot of velocity and is not likely to expand.
I have a shortened Walther P38 (P38k) with a 3" barrel and had the same question. Took the P38K and a unmodified P1 and ran som rounds over chrono to get some idea of what ammo to carry in it. The results where as follows with the chrono at approximately 10' from the muzzle.
Walther P1 with 4.92" barrel
Winchester 147gr JHP's = 949 fps
Hot Shot 124gr FMJ = 1,054 fps
Rem 115gr JHP hand load over 6.0grs of Unque = 1,257 fps
Walther P38k with 2.92" barrel
Winchester 147gr JHP's = 614 fps
Hot Shot 124gr FMJ = 952 fps
Rem 115gr JHP hand load over 6.0grs of Unque = 1,139 fps
The loss of barrel length reduced the 147gr bullets velocity by over 300 fps to a point where any bullet expansion was unlikely while the lighter bullets only lost around 100 fps.
My own choice was to load the pistol with 124gr Winchester Ranger Partition Golds with a factory muzzle velocity of 1,185 fps from a 4" barrel. These should be over 1,000 fps from the P38k at its muzzle and should retain enough velocity to assure expansion.
