Here is my plan: I know a guy who built one like this... I have a P-17 Winchester action that I want to barrel and have chambered to 300 RUM. My thoughts are it have a 30" 1.125 Stainless barrel with a slow twist for shooting light bullets...125 to 130 grain. I'd like to see 4k FPS or more. I doubt I'd ever use it on anything bigger than whitetails.