I couldn't view the video - they said it was "private".
How accurate was the gun (or the shooter?) When mine was a smoothbore, it was literally hit or miss at 50 yds. Relined with rifling makes all the difference for accuracy.
The bottom one is the Belgian .50, the one that needs a good spanking before it'll shoot (probably made in 1842).
The top one is an 1868 Springfield 50-70.
So, what's next on the Black Powder Wish List? A handgun?