I saw that on the ball and figured it had to hit something hard to make that crease. Glad that mold worked out for you.
Those front shots are tricky. The deer I shot with my Lyman Flintlock Trade Rifle a few years back, was a front facing shot. It went all the way through her vitals using 90 grains, passed through her, and still had enough power to break her back leg before that ball disappeared in the woods.
I just can not tell people enough the power and outright deadly combination a traditional roundball rifle makes in the right hands. Your proof of that. And all that practice you do made you confident enough to take that shot. Nice going.