Hometheaterman, you need a basic understanding of the volume vs. weight issue in muzzle loading, and how we got to where we are today.
Originally,
with real black powder, volume and weight were the same and were usually based on FF grade black powder. So, if one wanted to make a 100 grain powder measure he would weigh out a 100 grain weight charge of FF black powder and build the measure to hold that amount. Now he has a 100 grain powder measure (and volume and weight are equal).
Then along comes the first black powder substitute - Pyrodex. It was designed so that the amount of Pyrodex that fit in that 100 grain powder measure provided a charge with
energy that approximated 100 grains of black powder. However, because Pyrodex is less dense than real black powder, that 100 grain "volume" charge actually weighed something less, closer to 80 grains. Then along came other substitutes, all of varying densities. A 100 grain
volume charges of any one of them will weigh something less than 100 grains. For example, Triple 7 was said to have gotten that name because 77.7 grain weight of it would fill a 100 grain volume measure.
So in muzzle loading, unless a person specifically states he is shooting "X
weight" of powder, it is correct to assume whatever charge cited is a volume charge (i.e. the amount of powder it took to fill a
volume measure to the stated charge level).
Not what could be clearer than that?
(Yeah, I know. I even got confused trying to write this.)