Maximum velocity from .40S&W? Lots of luck. I have had one case failure in 40+ years and that was .40 S&W. The web simply isn't that strong to push anything with that cartridge. You will need to work up from a low start load and watch carefully for pressure signs.
For max velocity, you'll need LongShot or 3N38.
AA5 is the most accurate powder I have found, but only for light loads up to mid-range between start and max. For near max, Silhouette has been the most accurate.
For max velocity, you'll need LongShot or 3N38.
AA5 is the most accurate powder I have found, but only for light loads up to mid-range between start and max. For near max, Silhouette has been the most accurate.