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Pyrodex is the most common "black powder substitute." It is really the only synthetic black powder "performance" substitute in common use. By performance substitute, I refer to a charge of loose powder measure by volume. A 100 grain volumetric charge of Pyrodex RS (Rifle/Shotgun) is very close in performance to Goex FFg black powder.
There are differences, though, and this is where things get a bit convoluted. Pyrodex is bulkier, another way of saying "less dense." By weight, it is more powerful than Goex black powder. But, the traditional method of measuring black powder is indeed by volume, so in that sense it is a black powder performance substitute.
By actual weight, it is not the same. 100 grains measured by volume of Goex FFg is about 101.3 grains by weight. 100 grains measured by volume of Pyrodex RS is about 72.5 grains by weight. Pyrodex is where confusion can start to set in, as the standard "F" designations of powder coarseness start to go out the window.
Pyrodex "Select," formulated for use in muzzleloading rifles, is touted as an "extremely consistent" grade of Pyrodex, and has the largest grain size of them all. It is even farther away from black powder by actual weight; 100 grains volumetric equals about 63.9 grains by actual weight.
Pyrodex, though man-made and with a variety of additives, still has sulfur in it and is corrosive. It is classified as a smokeless powder by the DOT, and bears little resemblance to traditional black powder in actual weight or grain size. It is a bit harder to ignite than black powder, and is safer to handle, use, and store due to this fact. It is also not as impact-sensitive as is true black powder. Pyrodex is not classified as an explosive as is black powder, and is sold at many chain stores due to this fact.
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What's your problem, you accuse me of assuming everyone shoots as much as I do when I clearly said just the opposite I even explained and defended those who shoot only a small amount for exactly the same reasons you gave yet none of that mattered to you in the least and because you were somehow offended you resort to childish name calling?
Go back and read what I said before mouthing off!
How about practicing what you preach? The part of my post that you quoted was not directed towards you. It was directed towards Don. Also, please show me where I called anyone a name. I don't recall doing so and I cannot find a single instance of name calling in my post. The worst thing I did was call the BP vs substitute argument stupid. I didn't insult or attack a single person.