I've been to the fantastic Palm Springs Air Museum probably a half a dozen times over the last few years, and finally decided to volunteer there. As the very nice lady conducting my interview showed me around, I happened to notice they have a small display tucked to one side of various types of ammunition.
Of course, they have the usual suspects, such as .30cal belts, and .50cal of course, and even 20mm. What was a tad surprising to find was a complete collection of 25mm ammo, including TP-T, TPDS-T, HEI-T, and APFSDS-T.
Now, I suspect they've been demilled (at least I sure hope the HEI-T has been), but let's face it, 25mm is a bit odd to find in an air museum.
The 40mm made a bit more sense (even if it was for the 40mm/70 rather than the more common WWII 40mm/60).
XBradTC 
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