That may be true, but what's the expiration dates on those production lots?
Well, T-55 means the tank entered service in 1955 so ammo is probably 1960s vintage.
Ammo stores pretty well.
Shot a lot of 1940s and 50’s vintage com bloc back when it was surplussed to the US cheaper than dirt.
We were using repurposed WWII war stockpiles of 40mm Bofors naval cannon ammo in Afghanistan and Iraq after we burned through our Cold War stockpiles and could not produce sufficient new ammo to keep up with the burn rate.
Perhaps a lesson there? .
What 40mm weapons platform were we using in Afghanistan and Iraq that would use WWII BOFORs shells?