I hate to be the bearer of bad news but I would not shoot the rifle and especialy a 7 mm Remington Magnum after the rifle has been in a fire. In all probability the temper or the steel has been damaged in the fire. (*Changed! ) And could possibly blow up when a round is fired in it. So before I spent any money on it I would contact a professional gunsmith not just a repair shop and have someone that knows about this condition and the metallurgical property specification do some testing on the rifle. Unfortunately, fires have ruined a many of good weapon by damaging the temper of the steel. Even though it is not a Remington or Winchester I would contact the technical division of those companies and speak to a tech. specialist about the fire and effects it could have on the metal. They will have the information for you since I am sure it is not their first time they have been confronted with this question and possibly have done testing in this area.
Information and a word of Caution Only!