@oldpaps- I may just grab a clip or 2 of the ammo to match the gun and consider it part of the display. I have found (a little pricey) plenty of modern boxer cartridges to shoot and harvest the brass. Your story uninspired me to try shooting 1930's cartridges.
Concentrated power is not rendered harmless by the good intentions of those who create it.
"If you find yourself in a fair fight,,,
Your tactics suck"- Unknown