reloading manuals from the 70s list a max load of 11 grains of 2400 in the 38 special. there is no disclaimer that this powder/load shouldnt be shot in the k or j frame revolovers and those were around in the 70s. i think 2400 is a somewhat poor choice for 38 special because of the amount of poweder you have to use to get a good burn.
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