Nim, Why no medical grade 100 % cotton as a filler ? I have read on other forums such as BPCR.Net
ASSRA, and the Cas City forums about using loose cotton as a filler ? What would be the difference
between Puf-Lon and Dacron that many are using now for fillers ? I did an experiment and tried to
see how quickly the cotton would burn. It did burn, however it first turned into a little charcoal ball . If
there is any doubt at all I can just as easily use cream of wheat for safetys sake ! I could see where the charcoal ball could act as an obstruction in the barrel . What are your thoughts ? Could the cream of wheat just as easily goob into a gooey ball and obstruct the barrel ? Thanks
Black powder is an "explosive" while smokeless powder is a flammable. Smokeless ammo relies on a very rapid pressure buildup to propel the bullet down bore. Black powder goes "BOOM"
Any filler - at least the prevailing wisdom states - should have a density similar to the powder charge and completely fill the case with some slight compression. If you are using a filler that is less dense and allows for the case to become a piston, you are generating pressures that may not be safe, or at least can damage your firearm.
The powder burns from the bottom. As it burns, it forces the unburned powder forward like the piston of an engine. Loose cotton or any other filler that does not take up the unused space properly, will create unknown pressures. If your cotton filler is packed in densely, there may not be a problem. If it is loose, there will be a theoretical problem.
My face and guns want there to be no problems. I don't use any fillers.