I've got an idea and I'd like to get some info from anyone that has ever made a wildcat round themselves, or had a rifle built on a wildcat. I'd like to have one custom rifle before I'm done and why not make it my own cartridge? I'm considering necking down a .375 Ruger to (most likely) 30 cal. I believe I would have to move the shoulder back some to keep a reasonable length neck. In doing so it looks like I'd basically be doing an Improved version of the old .30 Newton. I realize this is going to be expensive..... Any advice?