40SW is one cartridge I use one powder for all loading requirements(from Nosler 135 gr JHPs to 180 gr JHPs or LSWCs). I use Winchester Super Field(WSF). The reason I like it is that with this powder I can pretty much duplicate any factory defense load without excessive pressure as well as produce comfortable target loads. Also the lightest charge(smallest volume) I use is 5.2 gr for 175-180 gr LSWCs and if I were to double charge by accident it would fill the case and be very easy to spot.
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