I don't have anything in my reloading manuals specifically using a 125gr LRN bullet and either Universal Clays, or Clays powder. The Hodgdon web site lists a load for a 125gr LCN bullet. I'm assuming this is a typo and should read LRN for lead round nose. I've contacted Hodgdon to confirm. That data reads as follows:
http://www.hodgdon.com/data/pistol/9mmluger.php
125 GR. LCN (Starting Loads)
DIA. .356"
COL: 1.125"
Longshot 5.0 1052 24,700 CUP
HS-6 5.9 1023 24,400 CUP
Universal 3.8 993 24,400 CUP
HP-38 3.9 1009 25,700 CUP
Titegroup 3.6 1002 22,900 CUP
Clays 2.9 899 22,700 CUP
125 GR. LCN (Maximum Loads)
DIA. .356"
COL: 1.125"
Longshot 5.7 1115 28,300 CUP
HS-6 6.6 1124 30,700 CUP
Universal 4.3 1096 31,300 CUP
HP-38 4.4 1086 31,200 CUP
Titegroup 4.0 1096 30,400 CUP
Clays 3.3 993 30,900 CUP
Here's some other 9mm loads that might interest you. I've used the Bullseye load below to good effect in my Beretta and Taurus 9mms. As with any load, step down 10% and work your way up.
125 grain Lead RN (.356" dia)
Bullseye 4.7 gr. 1,105 FPS
Unique 6.0 gr. 1,165
No. 2 4.2 gr. 1,002
No. 5 6.2 gr. 1,133
231 4.0 gr. 1,035
WSL 3.8 gr. 985
WSF 4.7 gr. 1,055
If you haven't already done so, go pick up a couple of good reloading manuals and compare the loads to what they have listed. Be safe and have fun!