I am starting to reload for my h&r single shot 500 s&w rifle, because I can't find any ammo for it. I have reloaded a little in the past. By little I mean, 50 rounds of 308. So I have some what of an idea on how to go about it. But looking for things I should be looking for when reloading for the 500. Also looking for a good place to start when it comes to powder, amounts and what people find the best. I was planning on maybe useing w296 because it's what I have on hand. Any pointer or help will be greatly appreciated.