I am taking stock of EVERYTHING this Gun Nut has amassed and putting it, line item by line item, into a spreadsheet. I have not done this in 10 years. It is valuable to know how much the arsenal and equipment that supports it has grown. And it is important to (remember) indicate where everything is stored. Lead in the shed. Safe(s) in the garage. Primers here. Powders there.
Take digital photos of EVERYTHING. Render the photo items into words. Include the PROPER NAME of equipment, bullets, parts & pieces, etc., Mfg. stock number, and a reference from where the UNIT COST of an item was derived.
You will surprise yourself, in the first place, with how MANY items you have. You will surprise yourself further if you "Go The Distance", use the Internet, and turn the spreadsheet into an estimate of today's RETAIL COST to replace everything in your inventory. "What if" you had to buy it all - everything - at today's market value?
A number of items are discontinued (been at this a long time) or are out of stock. The price listed on the Net for any of these items is questionable. Just include what you THINK those items worth today. Most items will still be for sale, but for MORE than you paid (hopefully). Include the best AVAILABLE value you can find. After all, it is only an ESTIMATE and much better than nothing.