Stick with the basic well-known, available and classic powders that most started out with. WW231 would not be my first choice but it works. Alliant's Bullseye works terrific and so does Alliant's RedDot. Accuracy can be very good with the 40S&W round. My first and last choice is a RandRBullets.com [Magma engineering] cast lead 155grain SWC behind 3.8grains of Alliant's PROMO powder.
4gr n320 180 Berry 750 fps g22.
I don't think you can beat Longshot if you want the best BANG for your buck - awesome muzzle velocity and fireballs. 7.5 gr with 180gr Berries got me around 1130fps. I switched to Power Pistol now, it's more tame which is nice. Got a pound of WSF to try some day as well. 7.2gr PP with 165gr AIM got me around 1100fps.
Have you noticed your ejected brass is pretty dirty inside and out?



























