How disassembled are you talking? Mine is stored in the factory beretta socks in it case so action/buttstock in one barrel/forend in another sock and the othe barrels in the other sock. Its all greased and oiled and ready to go.
Not sure if its the right way or not.
If you store the O/U in the case broken down, you can release the locking lugs (at least on the Beretta 686) to not keep them cocked perpetually.
I don't worry about spring tension during the season, but I agree that, for guns designed to facilitate decocking, this is worthwhile. Big difference between decocking and using snap caps, though. Snap caps are a good approach to decocking during the season, when the snaps caps won't stay in the chambers for long. But, NEVER store your guns long term with the snaps caps inserted. Doing so promotes moisture retention and badly rusted chambers are often the outcome.
Another well-intentioned "preventative" measure that all too often backfires is oiling after cleaning. The last step in most cleaning routines is usually oiling the barrels and receiver. Literally only a few drops of oil on a patch is required. Many, if not most, over oil their guns due to a sincere desire to prevent rusting. The problem is that most guns these days are stored upright in gun cabinets. Over the course of months in storage, the oil leaks down through the workings and soaks into the stocks. Oil-soaked wood turns punky, loses all it's strength and turns black and soft like wood rotting in the forest.
Dealing with this today actually. I’ve been sweating oil out of a SxS stock with a heat gun...carefullyoil is the bane of vintage SxS. Too much applied for 100 years equals rotten, punky wood.
I'm with 1963 Beretta, assembled, decocked as appropriate, muzzle down in gun socks. I live in a dry desert climate ( yes, in Canda) so moisture damage and rusting is not a problem for me. In the rare instance where I need to leave a gun broken down and cased for awhile I make absolutely sure the gun is dry, clean and wiped down with a slightly oiled rag, being diligent about removing fingerprints and excess oil. Release hammers first by tripping on snap caps before disassembly or by snapping with firing pins striking a hardwood block to prevent damage. On Berettas I also relax the top lever back to center.
Dealing with this today actually. I’ve been sweating oil out of a SxS stock with a heat gun...carefully
Assembled in gun socks and muzzle down



























