Ok, we all know that when it comes to dangerous game... (Bears), especially big ones up close, that caliber makes a difference in many people's minds, as well as the model of weapon, ammunition, bullet construction, even how you wear the weapon and so on.
Here's my pick for one, if not, the most important part of it, "accuracy"… I know we have red dots, and many different optics to pick from, along with fiber and tritium, and then there are the traditional iron with or without brass beads and inserts, but… what it really come down to is lead where it belongs on target, and the amount needed to stop the attack.
So, my point; I think "instinctive shooting" plays a good part in winning the battle for survival in these cases, don't get me wrong a well-placed shot is always preferred, but… realistically that's not always possible in manny types of an attacks.
Many years ago I spent time with Jim Gregg in the '70s who I considered one of the best instinctive shooters, even to this day, everything was point should and lower, he had a fantastic course, later I had a chance to work with Bob Munden, another exceptional instinctive shooter, you could lay their instinctive shooter overlays on top of each other.
Rob Leatham, who I met and had a chance to shoot with, pretty much agrees with the aforementioned, for the most part, sights are great, but... If you want too win, get the pointy part pointed at the target and work on trigger control and instincts target acquisition.
The case I'm trying to make, is that, if you are going to get the best number of shots off and well placed taking a good sight picture might not be the best avenue to take at a close range distances where Mr. Bear is bearing down on you in fourth gear and we all know you can't miss fast enough to hit the target… I know, not everyone can master instinctive shooting or wants to for that matter, and it is a diminishing skill that you have to work with regularly… In that case, perhaps a "really" well placed shot with that first shot, using sight acquisition may be the only shot you get to make… good luck! Just my 0.2 Cheers