Hi there. Im wanting to buy me a new rifle, and I want it to be single-shot and have been looking at the Handi-Rifles. Im looking for a big-bore type cartridge. I know you can buy extra barrells for these guns but would like some input on what would be best for me to buy first. I'm going to be hunting Whitetail deer, wild boars, and might be going on an exotic game hunt. I already have a few rifles that I hunt with(30-06, .270), but want a bigger cartridge to use. Out of the 44 Rem Mag, 45-70, and the new S&W 500, what do u think would be my best choice out of these three for a big bore. I've been trying to decide myself but would like some help from other knowledged shooters. Let me put it in terms of a question. If you were stranded on a big-game island and had to pick one of the 3 calibers i listed, what would it be and why. LOL, kinda crazy, but would help me choose. Thanks, Justin