.454 or 500 S&W Magnum
Let's say that, hypothetically, you had to face down an angry/hungry boar grizzly bear.
Would you rather have a .454 Casull or a 500 S&W?
Pick your gun, bullet, load, and why you chose that one.
Note: I'm not talking about hunting grizz, but defense from the grizz.
So, I get my choice, in front of the bear, and don't have to carry it? .500 S&W
all the way.
I would hand load 420 grain Punch Bullets
http://www.beltmountain.com/punch.htm
Minimum load for that bullet with 4227 or H110 is around 1500 fps, 40K pressure, maximum around 1700 fps. I'd probably go with something towards the higher end, since I'm firing it out of a canon that soaks up recoil(pretty much any .500 S&W revolver) and, the fuller the case, the more consistent velocity, and best accuracy.
Punch bullets are tough. Saw one of those 420's shot into the ground, gravel and all. We dug it out, and, it was so strong, it was not deformed in anyway.
We cleaned it off, and, considered loading it again, after measuring carefully.
They break bones, and penetrate pretty much forever, like 4-6 feet in bison.
And, they go straight.
Second choice is a LFN, around 525 grains, and 1100-1200 fps. Couple guys are using these on pigs, deer, and, they swear they are second only to Thor's Hammer in effect on medium sized game.
On the otherhand, Gary Reeder says his bear soaked up a couple such loads, with 440 grain bullets, and the bear kept going. He pushes 350 grain LFN at 1350 fps, or so, IIRC.