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Have tried all 3 Fg, FFg and FFFg all three make it go bang and smoke my preference thought is FFg for the 45-70.
Right now am going to try FFFg in my 40-70 SS.
I was using Goex Cartridge grade and it worked good, I liked it better then the other GOEX grades, but I have moved on to Swiss and prefer it, less fouling and higher velocity, much lower SDs.