Originally Posted by Hunting Man
My guess is Pellets are designed to burn at a specific rate, different than powders like pyrodex. I would highly discourage your buddy from experimenting and stay with conventional loads. With today's ML performance there is absolutely no reason to mix up your own concoction.
In this case, both the Pyrodex and the 777 are in pellet form, as the OP said. But I agree, don't mix different powders. Play stupid games, win stupid prizes.