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I just called my local source for black powder (BP) and was informed that he is out of Fg, (as well as FFg and FFFg), but he has cannon grade (Goex).
I have only used Fg in my scale artillery to date, ( 1 inch bronze cannon, golfball mortar, soda can mortar, .30 cal & .50 cal brass mortars).
I believe that cannon grade BP is supposed to have larger size powder grains than Fg.

QUESTION: Is cannon grade BP safe to use in place of Fg and what if any different results should I expect?

Thank you for your responses.
 

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Cannon grade will work just fine.

Just theorizing a bit here. When Matt Switlick did his pressure testing with the 3 inch ordnance rifle he found that Fg loads equivalent to the Cannon grade loads produce 40% more pressure at the same relative velocities.

So my theory is that Cannon grade loads equivalent to an FG loads should produce 40% less pressure and the same relative velocities. Don't know why that might not be correct.
 
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