I have a Remington 700 BDL 221 Fireball for my ski hunts. It feeds the short cartridges perfect. Due weather, I need to convert this rifle to a detachable magazine rifle in order to avoid frostbite. Even with the old CZ 17 hmr and 2 magazines, I get a borderline sting in a few fingers due reloading, so I've decided I need 5 magazines for my Remington. I am unable to google up any solution for this. I find 221 followers for the BDL easy enough, but no magazines. Has anyone done this? Or will it be a full custom job. The film shows the hunting and conditions.