The same 8-10 grains of W231/HP-38 work even better for me, and shoots cleaner as well using standard primers. For the jacketed 240s, 14.2 grains of HS-6 has been super accurate for me, with loads around 1300 fps. These hit hard and won't stress the S&W like full blown loads will. CCI-350 magnum primers for the HS-6.
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