Hello All,
I received a 10 pound lot of "Skirmish Powder" from Powder Inc. It is advertised as having a Similar granulation to 1F Goex.
I found some interesting info about this powder. (Copy and Paste):
Hello,
I just called Powder Inc. The skirmish grade powder is a blasting
powder 4Fa, NOT 4FG. Blasting powder is a coarse black powder with
little or no graphite glazing. It works great in artillery. The guy
at Powder Inc says this skirmish grade is equivalent to 1FG. There
is web site out there that explains the grades of blasting powder
and the size of the corns. I cannot remember it now.
Tallyho,
Gregg
(Reply)
The Fa powder are properly called fireworks powder not blasting powder,
though for some reason this term is sometimes applied to the Fa powders, even by some suppliers. Blasting powder is a different animal and it is important not
to to confuse them. As Gregg pointed out Fa fireworks powders differ from the
Fg sporting powders in that they are not tumbled with graphite.
Both type 'g' and type 'a' black powders are made of the same ingredients
(Potassium Nitrate, Sulfer, and Charcoal) and milled the same way. The
difference is in the finishing process. Fireworks type 'a' powders are not
tumbled, or
tumbled only briefly, to knock off any sharp or long projections on the
granules. The sporting type 'g' powders are tumbled with a small amount of
graphite, with modifies and slows the burn rate, and gives a small measure of
resistance to moisture absorption. As black powder is a surface burning
explosive
(individual grains burn from their surface inward as opposed to detonating all
together like modern explosives) the graphite coating can reduce the rate of the burn, but only slightly. *Note that grain/granule sizes are not identical
between type 'a' and type 'b' powders, that is FFg is not the same size grain as FFa. I use FFa in my cannons as it is the same grain size as type 'g' cannon
powder. As Gregg indicated this Skirmish powder is 4Fa fireworks powder and is
size equivalent to Fg sporting powder. The 'a' powders are larger grained for
the same F (grain size) rating.
BUT IMPORTANT** Real black powder blasting powder, known as type'b' (Fb,
2Fb, etc.) is a different chemical composition and should NEVER be used in black powder weapons. Type 'b' blasting powder is a Sodium Nitrate based (instead
of the Potassium Nitrate in sporting and fireworks powders) black powder and
delivers a higher shock value than the type "g" and 'a' powders. This higher
shock value can damage or burst firearms and artillery barrels. (end)