My groups on my Knight Disc open up when I go over 80-90grs of Goex FFF...My current load is a Hornady .430 XTP in 300gr...It groups well with 80grs and I've killed several deer with it...The ones I didn't want to run off, I hit high in the shoulder or low in the neck and they fell right there...None of the lung shot deer went over 50 yards...I'm happy...

In my .54 caliber flintlock that I built in the 80s, I started with 120grs of Goex FF...After a few years I backed down to 100grs of FF and for the past 10 years or so I've been using 80grs of Goex FFF...

Dang if I can tell a difference in how well that round ball kills...