This has been answered several times but obviously you haven't seen the answer. Answer is NO! The pellets were formed to roughly duplicate the performance of Pyrodex pellets so because the 777 has more energy per grain they backed off on the load for the pellets. 100gr. of loose 777 will exceed the performance of 100gr. of Pyrodex by about 15%. And as a side item you cannot use 150gr. of 777 in rifles specifying 150gr. load of black powder or equivalent. 777 is not an equivalent powder!! It is quite a bit more powerful. Hope this answers the question.
