Alaskan Bears
You will find TONS of information and speculation here, on Alaska Outdoors Forum
http://forums.outdoorsdirectory.com/index.php
or if the link does not work paste this into your web browser
forums.outdoorsdirectory.com/index.php
and, of course the Alaska Department of Fish & Game web site has a wealth of black bear and brown bear/grizzly bear information (and fish, moose, canoe etc)
home page:
http://www.wildlife.alaska.gov/index.cfm
or
wildlife.alaska.gov/index.cfm
for bears in particular
http://www.wildlife.alaska.gov/index.cfm?adfg=bears.main
or
wildlife.alaska.gov/index.cfm?adfg=bears.main
By the way, the 45 Colt (there never was an official "Long" Colt, but even Colt's Manufacturing has used the misnomer , bowing to common useage) is longer than the .45 Schofield and vastly different from the .45 ACP, but calling the 45 Colt cartridge a 45 Long Colt is redundant. Kind of like calling a cue ball the white cue ball. Cue balls are unnumbered and white. 45 Colt cartridges are longer than the .45 Schofield.
The 45 Colt cannot be loaded (safely) to .454 Casull pressures. If they are to be fired in ultra-strong guns like the Thompson-Contender or Ruger Blackhawks or Redhawks they can get close to 44 Magnum energy levels (and pass them in momentum because of the ability to use heavier bullets), but the Casull runs at twice the pressures that would blow out the primers of the 45 Colts. When Dick Casull in the 60's and 70's developed his fine firearms and the cartridge that bears his name, he may have started with the 45 Colt, but quickly found his desired power levels beyond the reach of that cartridge casing. You can pump up the 45 Colt to good bear cartridge levels, but if you want more than 1500 ft-lbs of energy, get a Casull. And if you want a lot more more than the Casull's nominal 2000 ft lbs, 500 Linebaugh, 500 S&W or the like. Most experienced folks feel 1500 is overkill for any game animal in the Americas, but I leave that discussion for others.
You will find plenty of information on the web site with which I started this post.
Lost Sheep