Why do we use Pyrodex?

Recently I purchased some Goex black powder for one of my rifles.So I figured I would also try it out in one of my other rifles.It had more energy and also seemed to clean up easier.Using the same rifle,bullet,sabot,and charge volume.I shot at a steel sheet that was probly just under an 1/8 inch thick.The Pyrodex load would put a very deep dent in it.The Goex load would blast right threw it.And it just washed right out of the rifles when I cleaned them.Yes it was dirtier than Pyrodex but the...

Why do we use Pyrodex?

Why do we use Pyrodex?