First off sorry to hear of your misfortune to have had a fire.
Guns, marine equipment (boats, motors etc.), jewellery, art, and other items the insurance company deems to be in the same category, are only covered to a specified dollar value as specified in your home owners policy. If your guns were listed as insured on a separate rider under your home owners policy then you have additional coverage on that item. The question then is are you covered for present day replacement cost, or the estimated value of the item when it was lost or destroyed. For example if you had a mid 80's M-70 30-06 with a Bushnell banner scope on it. If you have full replacement cost then you get to go buy a new M-70 and comparable scope. If it is only covered for the estimated value of the gun and scope when lost then your not going to get much money for the item.
I had my hunt camp broken into many years back, they took a perfectly good old fibre glass canoe and an old but working 2 hp motor, since we had no separate riders covering them our policy only paid out $200.00 for marine equipment, so that's all we got.
Now that you have a claim your file will be turned over to an adjustor who will know every fine point in your policy and will interpret them to the insurance companies advantage not yours. Your house and contents will be covered "up to" the dollar value listed in your policy. Loose any thoughts that you will benefit financially from this loss as it is highly unlikely. The insurance company is going to be looking after their interests first and yours dead last. Having receipts for items is a huge benefit as it proves what you originally paid.
I speak from pure very hard earned unfortunate experience over many years with having to deal with insurance companies. Insurance companies are heartless sharks and I wish you all the best while dealing with them .
