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Trial and error
I have used approx (when I say approx) I mean the spout on a copper powder flask when you hold the lever and turn it upside down and release it, most spouts for a 44 c will hold between 27 g to 30 g . At 25 feet you will blow a bigger hole through a 2X4 w/goex than Pyrodex. You might not get it thru the 2X4 w/pyrodex. Real bp is more powerful. The substitutes are safer!!!! I have not tried it yet, but I have heard that Triple 7 is the best. I don't know
WBH
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