I also use the same gun with .451 round balls and also use Goex 3f, but I use enough amount of cream-of wheat on top of the wad to keep the ball flushwith the cylinder
holes and Iusea little Bore Butter spread evenly over the balls.Doing the above,the bullets don't have much of a jump into the barrel and will improve accuracy. I also have an extra cylinder loaded and ready to go.
I have the SS repoRem. 1858.