Here's a few of my favorite 124/125 gr loads that I've used in my Glock 17:
Bullet: Precision Flat Nose; Powder: Accurate #7 7.8 grains; Power Factor: 131 (Jarvis barrel)
Bullet: PD Sales, Lead Flat Nose; Powder: Accurate #2 4.2 grains; Power Factor: 127 (Jarvis barrel)
Bullet: Precision Flat Nose; Powder: Accurate #2 4.5 grains; Power Factor: 133 (Jarvis barrel)
I keep the OAL for my cartridges between 1.089 - 1.115, depending on type, shape, and weight of the bullet and the powder that I'm using.
I also have loads for 147 grain, my favorite bullet, it you are interested.