I am curious..I just bought the Hornady 7th Edition Handbook..I notice that the case capacity has a slight edge over the .223 Remington..I did some online looking and the .222 Remington Magnum is not produced by any production gun manufacture...It looks like possibly Montana firearms makes the rifle chambered in the .222 Remington Magnum...So I was wondering if I could buy a Remington 222 and take the the rifle to a compent gunsmith/machinst and have the chamber made to fit a Remington 222 Magnum..those of you that have Remington .222 magnums how did you do it?..or has the rifles chambered in a 222 Remington magnum gone extinct...