I'm shooting Jack's Powder Keg #44 black powder for small cannons and muskets. It's made by Goex, and appears to be 4FA blasting & fireworks powder. That's unglazed powder, the "pass" screen is the same as for Fg and the "stop" screen is the same as for FFg. So it covers the granule size spectrum of both, more or less a 50/50 mix, and I'll bet that's what anybody's "1 1/2Fg" is. It works perfectly in my 15 gauge fowler with 2 1/2 drams (~70 grains) of powder and 1 oz. shot, just measuring both with a 1 oz. shot dipper. I use the same with a 1 oz. ball. The regular reenactment powder, BTW, is 5FA. Unglazed blasting & fireworks powder with the same screen sizes as FFFg, and functionally equivalent to it. A little less expensive when available.