Want to change powder to reduce muzzle flash

Nipigon Jack

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Brantford
I am currently loading for my 40s&w using winchester 231 but am getting muzzle flash that i don't get when shooting factory ammo. Only using 4.5 grains under 180 grain campro so these are fairly tame loads so its not the amount of powder.
I assume that i need to look at a faster burning powder to reduce the muzzle flash?
Looking for confirmation and perhaps a powder recommendation.
 
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