Quote:
Originally Posted by BLUEDOT37
It's odd, I looked in my 1978 Winchester load data pamphlet & they only listed shotgun load data for W540, no pistol data.
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It would be necessary to research old data from a variety of sources for the best answer, but I suspect Winchester 540 shotgun powder gained popularity as a handgun cartridge powder under the Hodgdon HS-6 designation. Winchester data promoting 540 for handgun cartridges probably came later. Possibly the experts here would know if this is a correct summation.