Both "Forgotten Weapons" and "In Range" are fantastic.
Forgotten Weapons introduced me to a lot of firearms history of which I was totally unaware.
Things like the Liberator[1] and 2-Bore rifles[2], although with the latter, I'm going to assume that you're hunting smaller naval vessels and/or low-rise buildings. Or you're looking for the fastest possible way to bruise the hell out of your shoulder, and want to set fire to a small pile of money at the same time.
In-Range -- which features both Ian from Forgotten Weapons, along with his co-host Karl -- does a lot of other interesting stuff. Tons of different shooting competitions, plus some informative Mythbusters-style segments.
My two favorites are the Shockwave vs Double-Barrel[3] and the mud tests of the AR[4] vs the AK[5] platform.
Both of those are worth watching, but if you want the tl;dr: (1) A double-barrel shotgun is a poor home-defense weapon, but the Shockwave is even worse in pretty much all cases; and, (2) the AR is a more reliable platform than the AK in real-world conditions.
[1] https://www.youtube.com/watch?v=1CjndIiZyJo
[2] https://www.youtube.com/watch?v=OYlDgwo52tI
[3] https://www.youtube.com/watch?v=tYjThckYqBQ
[4] https://www.youtube.com/watch?v=YAneTFiz5WU
[5] https://www.youtube.com/watch?v=DX73uXs3xGU