Go here
http://www.wichitabuggywhip.com/fire...ckpowder2.html
It will explain more than i can type tonite. I make my charcoal from kiln dried white pine , that is important.
DO not use the Precipitation or CIA Method as you will get ****.
You CAN make better BP than you can buy. You cannot blow up your gun or hurt it if not overcharged.
After I ball mill it for 6-10 hours I put it into a plastic tub and stir while spraying with a 50-50 mix of rubbing alcohol and water till just damp with an old 409 sprayer (you will see it turn real black) DO not over wet.
what you want is to be able to squeeze some and have it stay together but crumble apart easy.
Put a peace of aluminium window screen over a bucket or large bowl and work it through by hand or with a plastic spoon it will granulate, pour onto several layers of newspaper , spread out to dry. turn jently every hour or so till dry and your set mate. any more questions don't hesitate to ask. and remember , charcoal is the key , cannot use store bought.
Buy a cheep scale from ebay that measures to 1 10th of a gram and measure carefully. The harbor fright rock tumbler works fine with 50 cal round balls in it , say 30-40 of them.
you can buy the Potassium Nitrate here
http://www.skylighter.com/mall/chemicals.asp?Sort=P
as well as sulfur
Much , much cheaper way to shoot and it expands your hobby.
The size , ie ff , fff and such is determined by the screen size you use.
After dry pour it into your screen again and tap gently to remove the fines(dust with can be re wetted and granulated again.)
You can also add 3% dextren when ball milling , its a glue if you will and make the grain harder. (less dust)
You can get everything at the site I listed and the mill at HF
Jeff Noyes
0- and do not mill wet , you will get ****.