I still kick myself for not buying a crated case of Mosins in cosmoline back when.
/i> I admit to being a bit of a hoarder; I sold most of them when money got tight. I kept my 3 favorites along with some spare parts. Some people don't like them, but I like that they can take a lot of abuse.
I reload cartridges with boxer primers to reduce corrosion... and I use slightly reduced charges so that my homemade lead bullets with homemade aluminum gas checks don't make a mess out of the barrels. These days it actually saves a little bit of money. But I like the original Soviet block ammo as well. The lacquered steel cases tend to get jammed in the gun easier though. Luckily, the Mosin Nagant can take a little rough handling to get them free.