Bears can hit speeds up to about 35MPH. In a head on charge, lead is important. How much lead does one need to hit bear in the head with the first shot? Something to consider and quite frankly I don't have an answer.
Maybe someone of here does who's been there, done that.
If heading towards you, no lead is necessary. If running parallel to you, lots of lead is needed, but then is it really charging you if it's running parallel to you? All angles of approach from one to the other extreme (parallel to direct) will vary as to how much lead is necessary, the closer to direct, the less lead being needed.
The more
proximate the animal is, also, the less lead is a necessity. At bear attack ranges, lead is probably not an issue at all for this reason.
