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Gringo Loco
I will attempt to be clearer. Let’s say a 270 improved will use 60 grains of, say, R24.
Use 15-20% of that charge of Bullseye as a starting point.

Or say you are “blowing out” 416 Rigby to an improved version which will use 110 grains of something, say 4430. So start with around 20 grains of Bullseye.