Also will a 458x2 cartridge fire in a standard 458wm safely?Is this done?Also is interarms/markx still in business and are they still in england?Is parker hale still around also?Since my rifle has cz on it will they back it if i brake a stock or need work or parts?Hows there service and how do i get in touch with them?Where in usa are they based?Do they offer a custom shop?