Store my 300's in large clear plastic fishing tackle box trays with pebble grain latex shelf liner material in bottoms. The biggest ones have have rows moulded in with adjustable dividers. One of the big box Home stores has them with best price. Then coat the metal parts in liquid wax, such as
White Lighting. The shelf liner keeps them from sliding around. You can use tape or sticky tabs to mark the outside of the boxes. After that it's your call, on a shelf, drawer, locked cabinet or small gun vault. Now I need to invent or find a computer software that lets you put some digital pictures and descriptions on a "page" you can either keep in the memory or print in place in ring binder.