It will depend on the firearm and the exact markings on the barrel.
Take it to a good gunshop for assistance. This is more than one type of 32 caliber ammunition.
Have it checked out by a gunsmith to be certain.
For a Smith and Wesson revolver in stainless steel that shoots short bullets, you might need a 380 caliber pistol or a S&W 32 caliber revolver.
It would almost certainly be chambered in .32 S&W Long.
Pull the triangle pin out from under the barrel and then slide the revolver out to remove bullets
Let's use the correct terms- BULLETS are the part of a CARTRIDGE that come out of the barrel. .32 Cartridges are now centerfire, but many years ago were rimfire. .32 rimfire guns have not been made in about the past 100 years, and are considered obsolete. There are also several DIFFERENT .32 centerfire cartridges- .32 Auto, .32 S&W revolver, .32 Long, .32-20 revolver, etc.
32 ACP
You will need the services of a gunsmith.
A .32 S&W Long revolver can fire the .32 S&W Long and the shorter .32 S&W cartridges. It is not compatible with any other .32/6.35mm cartridge.
Have a gunsmith examine it.
.32 caliber
7.65 is the same as .32 ACP