Big Al;
From an old NRA Handloaders Guide; Screen opening for DuPont sporting BP;
Screen Opening (square mesh)
Powder
designation--Pass----Hold
Whaling ----.4410"--.1560"
Life Saving-.1310"--.0650"
FG ---------.0689"--.0582"
FFG --------.0582"--.0376"
FFFG -------.0376"--.0170"
FFFFG -----.0170"--.0111"
Note that not all companies used the same standards.
Many, Many thanks for the above information, that was exactly what I was after.
As to a licence for the manufacturer of black powder, I have no intention of manufacturing black powder, I plan on making black powder for my own use. BIG DIFFERENCE.
I have seen a number of harpoon guns both old and new. They are all vary heavy as they launch a vary heavy projectile and need to be heavy! The reason for canon powder being so much larger than what we would use is to generate more pressure for the heavy projectile.
tw: I found the book on abe's site and will get an order out, thank you.
