One, two and three hundred yards. That's pretty much what most Brits set their sights at. There isn't much point in setting it in 50 yard increments starting at fifty yards, each leaf would be almost the same height.
On something large and close what difference would it make if you hit one inch high or low? The animal wouldn't care. Yes three hundred is a long way for a big bore but if you had only open sights to use it would be comforting to be able to just point and shoot. But only if the animal was already wounded and escaping of course.
