some night shots with SW9VE and Steyr M9 non flash suppressed powder same load same bullet powder primer and case. MrA's secret voodoo whodo juju added shot inside the same brass catcher but you cant see it from the flash M9 going off with same powder as first two Steyr M40 with same powder not that anyone shoots at night much. the flash doesnt stay around for even 1 second or half a second. no idea what powders flash and what powders dont. possible one powder doesnt flash the same in different calibers. so far VihtaVouri Powders N340 has worked great for me in 9mm. PowerPistol supposedly gives one of the brightest flashes would like to test more but its a pita shooting in the dark in last two pics it was pitch black but the first two had moon light and could see very well. camera has no night vision. safety number 1 concern. I try to record it on video mode on my olympus camera. not the greatest but its what I have. a good sight that had information on ballistics got taken down aeroballistics.com the flash from what I have read is a reaction with oxygen.