Why revolver?
Charter Arms makes or did make 40s&w revolvers. Not hammerless though.
Use Duckduckgo for those type searches. d:^)
I suppose you could buy a Taurus Model 405 and bob the hammer.
Ruger LCR
IF you decide to “bob the hammer” on any given model, it would be best to have a gunsmith do it for you. The hammer spring is designed/sized based on the weight of the hammer. By bobbing it, it becomes lighter, and you may need to go to a slightly heavier hammer spring to get reliable primer strikes. But IF you do have to, it shouldn’t be that big of a deal to have a heavier spring dropped in it to compensate for the lesser weight hammer. Be aware that the heavier spring will also make the trigger pull a little heavier as well, but that may not be a bad thing on a CC revolver.
All seriousness aside...I'm looking for the 22LR version for the wife. She no likee guns, and this is just a point and shoot revolver. Just in case she ever needs one at the last second. Yes, I'd make her shoot it some at the range for familiarity sake. I'd personally consider the 38 or 357, but doesn't look like there's a Ruger 40 in LCR. Also, any more, when I look at guns, I try to stick with one that aligns with the ammo supply I already have. May be your case..
Ever considered a High Standard .22 magnum derringer? Two shots, concealed hammer...bang, bang. VERY bad to be hit with .22 magnum, especially up close. They’re hard to find, but they ARE available. Mine has a holster that looks like a wallet. Awesome.
Is there some reason you want to stick with .40, like you already own several thousand rounds?
Smith does make a 10mm revolver that will shoot .40 cal. It's a bit big for a pocket gun.
.357 or .38 Special, small, hammerless
https://www.youtube.com/watch?v=QdZT3vTj5Rk
Understanding your’e looking for .40 cal but think about a S&W 340PD. Hammerless 5 round .357 weighs in at 11.4 oz. unloaded. Short barrel and is very accurate.
I don’t know of a .40cal revolver cartridge.
There’s a .41 mag though. And it doesn’t come hammerless. And is not a pocket pistol.
And, of course, there’s the 10mm and .40 S&W ROUNDS FOR SEMI AUTO HANDGUNS.
If you’re interested in a .40 cal wheel gun, consider the GP-100 100 in 10 mm. Like the .357 that will also take .38 cal, you can shoot .40 Cal from the 10mm.. Difference .40 cal S&W is 10mmx 22mm.... 10 mm is10mmx25mm.
Then you can always have the hammer spur bobbed....
How’s that solve your problem....
Any pistol with a hammer is more accurate when you have time to cock and aim, if you you don't have time then just point and shoot.
Any gun at ten feet is better than a knife.
May I ask why a .38 special is such an unwanted round? I keep hearing “stopping power”. Has anyone looked into the ballistics and stopping power of a .38 +P with defensive hollow point fragmenting rounds?
Smith and Wesson 640 in .357 and .38