It's not mandatory in all states. I know that VT and NH do not require it. NH recommends it, but doesn't require it. Here's the excerp from the VT hunting laws:
"GENERAL HUNTING INFORMATION
Wearing fluorescent “Hunter Orange” while hunting is your
choice in Vermont. Most states and Canadian provinces
require it for hunting upland and big game animals.
Records show that in mistaken-for-game hunting accidents,
the victim is almost always not wearing hunter orange.
Evidence from other states and Canadian provinces that
require the use of hunter orange clothing prove that it
reduces accidents and saves lives.
Wearing fluorescent “Hunter Orange” while hunting this
season is a choice you have to make. Your decision should
be one you can live with."
There you have it. Freedom to choose. I'm OK with that. I would just hope people make informed choices. They (and their loved ones) will have to live with the consequences of their decisions.
Others have offered up a sighting of roughly 2 inches high at 100 yards as a good sighting scheme. In my own experience I have come to favor a sighting of 3.5 inches high at 100 yards. This allows for the individual to hold dead-on (directly in the middle of the top and bottom) the animal out to roughly 350 yards.
Magnum calibers such as the 7mm Remington and 300 Winchester will extend this slightly. At 400 yards I hold directly on the backbone of the animal. The drop at this range allows the...