Thanks. I also tested a bunch of different types and weights in my pm9 and PM45's . In 9, I found Hornaday TAP the softies shooting. I went with HST in both 9 and 45 partially because could not tell a big difference and I got a great deal on case lots of the HST.
The "expansion slits" in the bullet are different in the HST 147 than the 124. Appears their was some thought in the design of the 147 not "just make it heavier".