My only experience with long term storage is on a .44 Rem cylinder. Thirty grains Pyro P, dry lubed felt wad (Cabelas), .454 with just a little lube on the top circumference where the lead meets the cylinder. Capped with #10 CCI and no special storage.
Went 16 months and then shot all 5 rounds without a hitch.
Loaded up a '61 in similar fashion and after about 90 days it shot just fine.