It is now recognised that the 115gr silvertip performed just as it was meant to in Miami, a side shot through the guys arm (I think) and into his lung which eventually killed him, would a .45 in the same place and to the same depth have made any difference, I doubt it. A lot of fuss was made of the fact that it stopped short of his heart, but it was taking the long route in after all.
Federal 9BP is generally accepted to be the best SP load, 9BPLE which is boxed as +P+ is indeed a superb round but shooting LEO only ammo has to be a bad move when the gutter slime District Attorneys get wind of it in court. If penetration is an issue go with 124 grain gold dots, golden sabers or hydrashoks thay all perform similarly, the golden saber is available to non-LEO's in a +P load and this for me would be a very capable round. With the short barrel length and light weight of your PT-111 however, I think you are better served with standard pressure loads, hope this helps.
Regards,
------------------
A Person Is Smart
But People Are Stupid
Mike H