From something I read a long, long time ago...
The energy per unit of single based gunpowder is remarkably uniform between all the different powders. The only difference is in how fast the energy is released.
Yes, I think double based powders would have a higher energy per unit content, but all the double based powders should be about the same as well.
Just out of curiosity, what is the next step and the point of obtaining this information?