I wondered when someone would mention Greg's work. Based on Greg's data, I load 11 grains of Unique and NO FILLER under a 400 grain cast bullet in my 45-70s for about 1000 fps and extreme accuracy. Load density is extremely low - like less than 10%. The powder supposedly detonates, but maximum pressure is limited by the small amount of fuel (powder) in the case. Whatever the reason, it works. I can shoot these loads all day long without discomfort, and so can my 11-year-old son.
Again, this load is to be used with NO FILLER.
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