Right now I am playing with
- WSF
- Universal
- Power Pistol
- SR 7625
- WST
- WIN 231
- tightgroup
They are all plenty accurate enough for glocks. Any of them will work for 9MM or 40. All of them flow well through a progressive press powder meter.
WSF, Universal, Power Pistol, SR 7625 are all medium burners and therefore are a bit more versatile and have more loading range.
WST and SR 7625 are the bulkiest. It would be almost impossible to double charge them in 9MM or 40.
If I wanted to load 9mm, 40SW and 10mm and only wanted to buy one powder I would take a hard look at these three, listed im my order of preference.
- WSF
- SR 7625
- Power Pistol