Pyrodex vs 777
I just recently realized that I have bought 2 different types of BP propellant, Pyrodex and 777 (both pellets). I use a 100 gr in my normal load. Here's the issue...since I assumed they were the same, I don't remember which type I used when sighting in my ML. So, let's assume I sighted in with 777 and switched to Pyrodex. Obviously, one is slightly longer than the other, but will the switch have a significant affect on my point of impact at 100 yds? I'm new to the forum so any help would greatly appreciated. Thanks in advance!
Ric