You just had a good day. Trust me.
The issue of Pyro in flinters is igniton temp. true bp goes off at 400 degrees,,pyrodex is near 800 degrees for a good flash/boom.
And No!! Pyrodex isn't Better! It's paten Pyrodex.
If it could change,,Why would the same outfit sell a powder too compete with it's self, called "Triple 7"?
When you use that whole pound of Pyro'RS, under varied conditions like,,a windy day, or a damp morning, or,,,aw heck,, it ain't a myth,,pyrodex and flinters just ain't a good mix. you just had a good day