I catalog my collection in the same manner that we catalog training aids at work. We use and Excel spreadsheet with one worksheet for each stock class. The stock classes are broken down as follows:
1300 Ammunition General
1305 Ammunition through 30mm
1310 Ammunition over 30mm up to 75mm
1315 Ammunition, 75mm through 125mm
1320 Ammunition over 125mm
1325 Bombs and Components
1330 Grenades
1336 Guided Missile Warheads and Explosive Components
1337 Guided Missile and Space Vehicle Explosive Propulsion Units, Solid Fuel and Components
1340 Rockets
1345 Land Mines
1351 Underwater Mine Explosive Components
1356 Torpedo Explosive Components
1361 Depth Charge Explosive Components
1365 Military Chemical Agents
1370 Pyrotechnics
1375 Demolition Materials
1376 Bulk Explosives
1377 Cartridge and Propellant Actuated Devices
1390 Fuzes (less bomb fuzes) and Primers
1395 Miscellaneous Ammunition
1410 Guided Missiles
For each item I have a column with Description, Quantity, Component, Markings, Verification of Inert Status and Refernce. So the description would be the overall item, ie Cartridge 6 PR 7 CWT AP Shot, Quantity 1, Component - there would be line for each component, projectile, cartridge case, primer, Markings would have any pertinent markings for each component, and verification of inert status would have information on how each item was determined to be inert, ie projectile is solid AP Shot and tracer cavity is empty, cartridge case is empty, primer is functioned, primer magazine is empty. Reference is any publication that I have that supports the information I have used to verify an item or identify an item.
I also produce a Free From Explosive Certification that identifies the item and has pictures showing how the item was verified inert, so for No. 36 Grenades as an example I have photos of the grenade disassembled. One photo which shows the body is empty. I will photograph these sheets when I get a chance and post them if you are interested in seeing them.