I have used HS6 off and on for 30+ years, and never had any problem using a RCBS powder measure, but I normally weigh weigh all loads individually, and trickle in the final teeny bit. (I load for accuracy). It worked extremely well with a 44 mag load with 225 gr GC cast bullets on 200 meter rams and minimal recoil.
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H Richard
SWCA1967 SWHF244
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