While reloading, or even fabrication of larger rounds may be possible, I'd be limiting it to solid projectile types only - there's just too much complexity in even a HE round for a backyard operation to do it safely.
Larger operations, such as the Wojo plant in Krakow could certainly manage most conventional munitions, especially the simpler ones, but anything with electronics or less than common materials/components would be an extreme rarity.
Post exchange munitions could be expected to have a much higher failure rate. I beleive even in the highly industrialized production lines of WWI, some artillery rounds had a failure rate (detonation rather than firing) as high as one in three. Rounds produced in 2000 using home workshops and the like could be even worse.
Bear in mind that WWI munitions were also EXTREMELY simple in comparison to modern day, or even 1950's rounds. From the 90mm reloading description, it sounds as if these rounds were also very simple - a case, propellant and solid projectile - no fuses, etc to worry about.
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