Things were a little limited back then. A lot of the ammo choices and cartridges didn't exist back when I was born.
1. Colt Agent with hammer shroud.
2. S&W Model 1950 Military in .44 Special, 4", with SWC gas-checked loads ~ 1,000 FPS. There was a young cop in Texas back in the day who might have had some recommendations.
3. Browning Auto-5 in either 12 gauge or 16 gauge.
4. Sporterized 1903A3 with Williams peepsight. I'd unscrew the aperture for shorter ranges to make it more of a ghost-ring.
5. S&W .357 Magnum 5".
6. Suomi KP-31.
7. Dunno. 20mm antitank rifle?