Some .32 Colt and S&W revolvers will fire .32 ACP, but not all will do so. Chamber dimensions seem to vary considerably. Being a rimless design, extraction is likely to be a problem, even if the cartridges will chamber and fire.

I recall a guy at the range some years back with a new Charter Arms .32 S&W Long revolver and a box of .32ACP, all from the same dealer at the same time of sale. Guy was convinced his new Charter Arms was defective because only one or two cartridges would fire in a cylinder full. I prescribed a return to the gun dealer, a tongue lashing for the salesman, and a box of .32 S&W Long cartridges.