Simply size up from a .30-06 shell. Use a new one and don't be cheap about the amount of lube. I use Imperial Case lube and it works great. As for loads, there are numerous manuals that have published loads. I've got loads from 180 gr to 285 gr bullets, but they are for my build. Sorry, not going to share. It requires research and development, but it's really simple and all the common powders are used... Varget, 4831, IMR 4320..... The new Lee Reloading Book, 2nd Edition, has 2 pages of info.