Now this is an interesting piece of kit reviewed by the Moss Pawn guys. The Martini-Henry rifle has a lot of history behind it that I won’t try to summarize. Just check out the Wikipedia page. I will say that this black powder gun made over 1,900 foot-pounds of energy at the muzzle, pushing a 480-grain bullet at over 1,300 feet per second, making it effective out to about 900 yards if you could manage to hit your target with it. The realistic maximum range is still not bad at 400 yards.
You can get one for just over $600 from Atlanta Cutlery if you’re interested.