It's a rather 'manual' process I'm afraid.
What works for me is to :
Hold the magazine so that the loading port is to my right side. I'm left-handed so that may have something to do with it, but my reasoning is that it helps when putting pressure on a previously loaded round to encourage it to go down and rotate.
Start the first round where the magazine lips narrow (easy as that's pretty much the only place it will load:-D)
Second and subsequent rounds go in by applying finger (or thumb) pressure on the primer end of the loaded cartridge and then placing the new round against the little ledge where the magazine lips narrow and pushing in and down. The added pressure of a finger or thumb on the already loaded cartridge seems to help more as the magazine fills.
If you place the new round against the shoulder of the previous round it encourages binding, so make sure you hit the little 1/8" wide window between the shoulder and the little ledge.
Something I just noticed while checking my work. I already knew that the magazine had a pictogram of a 5.7 cartridge on it for identifying the proper ammunition. I suspected it was life-size and correct. But how many knew that the circular depression between the pictogram and the loading port was also sized for the appropriate 5.7 cartridge base?
Probably everyone figured it out years ago, but I never really thought about what the circular depression was for before tonight.