I got up to 4.0gr of WST (settled on 3.8gr) with a FMJ. I really like WST in 9mm but I'm saving it for my .38 loads. I currently burn a lot of WSF in 9mm.
Gun: Ruger SR9/9E
Brass: Mixed
Primer: Fiocchi
Powder: WST 3.8gr
Bullet: CamPro 147gr RNFP (Thick plated bullet, manufacturer suggests using FMJ data)
OAL: 1.135
Weather: 25°C
Avg: 891
ES: 16
SD: 6
PF: 130
Gun: Ruger SR9/9E
Brass: Mixed
Primer: Fiocchi
Powder: WST 4.0gr
Bullet: CamPro 147gr RNFP (Thick plated bullet, manufacturer suggests using FMJ data)
OAL: 1.135
Weather: 23°C
Avg: 928
ES: 21
SD: 7
PF: 136