Actually what I wanted to know -is why brochures post pyro and trip 7 more power than real:confused Regulated by license--black powder
Measured by VOLUME, 777 is about 15% more powerful then real BP. The reason that they recommend lowering the load by 15% is to remain comparable to the BP loads... Has nothing to do with safety, just that if you work up the "perfect" load with real black, then try to switch to 777 you wont have the same accuracy or POI as your original load unless you reduce by that amount.
Of course.. as far as I can tell... If you work up that load with 777 (all I use so far) in the first place then it doesnt much matter...
I have no idea about the pyrodex as Ive never used it...