Excellent choice, and as the others have said, it can be safely loaded pretty hot, with large chunks of lead. I would use straight wheel weights, for bear. I love the .44 special, the .44 magnum, and the .45lc. It was called the .45 Long Colt, to differentiate between the .45 ACP, and the .45 Colt. I believe the first Thompsons were in .45 colt. (LC). Also the rate of fire was faster, at first. But the.45 LC will do the job as is, or pumped up a bit. Elmer Kieth, did a bit of shooting research on the .45LC, where at a long distance, I forgot now just how far, but it was a long ways for a pistol, and he was shooting at an old out house with inch thick oak boards, and the .45LC was punching neat holes through it. So it has some respectable thump as is. You could also get a Marlin .45-70, carbine, for your canoe, with a nice sling. It is light, and will put down anything in North America. But it do tend to kick a mite. Especially with 405 grain bullets. Haven't tried the 500 grain ones yet. I mainly use 305 grain bullets in it. But it also can be pumped up a bit, coming very close to .458 Win. Mag. The Marlin will hold it. Just get a good reloading manual, and re loader. You don't need to go fancy, with multi round rigs, a simple single bullet at a time rig will do you just fine. I have a multi round rig, and a single rig. When I was shooting a lot, when it was cheaper to do so, I used the multi round rig. I love my Lee, and Dillon makes a fine outfit also, as does many others. Just get a strong unit, and it will last you a life time. Get a good case vibrator, and case / medium separator. Dillon makes a good one. Get a good scale, and funnel. You can make a case block out of a piece of scrap 3/4 inch pine, to place your cases in while you are decapping, priming, and loading. Just be sure to check your powder loads,every so often, if you are using a multi round loader. If you are using a single round loader, you are hand measuring each powder amount. If you are using the multi loader, you have a powder measure, that automatically dumps a measured amount of powder into the primed case, but it is a good idea to monitor it now and then. Enjoy, that is a fine one!
Wayne
As expensive as even reloading has become, it is still much cheaper to reload, than buy factory ammo.
Wayne