Research on the cartridge .32 acp

I'd go to chuckhawks.com for that.

https://en.wikipedia.org/wiki/.32_ACP

https://www.luckygunner.com/lounge/32-acp-is-pretty-good-too/

https://www.personaldefenseworld.co...d-classic-pocket-pistols-chambered-in-32-acp/

https://gundigest.com/gear-ammo/ammunition/ammo-brief-32-acp-ballistics-and-history

For such general questions Google is your friend. Those took less than a minute to find.

My personal choice in ammo is Fiocchi FMJ. Won't expand, but gives great penetration.

Designed in 1895, first used in a firearm in the FN 1899 or 1900 (curious story).
Was in the WWI NAZI supply system, but .380 ACP (9mm kurz) was not as the .32 ACP (7.65mm Browning) could penetrate a helmet (of the era). The 9mm kurz could not.

71 grain FMJ work better in penetration than the 60 grain hollow points. None of the commercial loadings I've tried give an honest 900 fps (advertised) in any of the - several - pistols I have. They are low recoil and easy to shoot. They don't have a lot of surplus horsepower and depend highly on shot placement. Better than a sick smile in many cases.