The same 45 cal. ammo used in the 45 cal. revolver. This can get confusing, there are very different cartridges that are '.45'. In semi-automatic pistol the most common is .45 ACP.
The ACP stands for Automatic Colt Pistol, that is the company that developed the cartridge. But for revolvers, you would more commonly use the .45 LC (Long Colt) which is a longer round. Modern Derringer's are more typically a two barrel gun that shoots the revolver cartridge, at least in .45. There are many types and calibers of Derringers that have been made for a very long time. The best thing is to research the specific model of gun you have and get the manufacturers recommendations for ammunition.
No.
No. Only shoot the caliber printed on the barrel.
25ACP
It should be marked on the gun- something like .410/ 45 Colt.
hi the armi-galesi-brescia-brevetto-cal.6.35 shoots a 25 cal
Yes it is. But the derringer must shoot non-shotgun ammo, otherwise it is classed as a saw-off shotgun and illegal. 22 LR/SR derringers are acceptable, as are .38 spl, .44 cal, etc.
5.56 and 223 cal. are the same cartridge...........
32 automatic or 32 A.C.P.
I have a model '66 and the round type is .25.
Not to my knowledge. I do have a .32 rimfire pistol with a little over 100 rounds of ammo for it. It does shoot but I don't shoot it anymore for the simple reason that you can't get any more ammo for it.
Almost certainly NOT an antique. Made by Leinad Inc. in Ducktown, TN. They also made a side by side .410/.45 derringer. I have one and it is very impressive to shoot.
You need to contact S&W for a correct answer.