I've never heard of it being done. I would guess that if you could get an appropriate magazine and you swapped out the recoil spring for something softer you could use a .40.
Since the 40 S&W is a shortened 10mm cartridge, is it possible to use them in a 10mm handgun? Wouldn't the distance from the end of cartridge to the rifling be shorter than that of a revolver?
I've never heard of it being done. I would guess that if you could get an appropriate magazine and you swapped out the recoil spring for something softer you could use a .40.
In a semiauto pistol:
While it's theoretically possible to get a .40 to fire in a 10 mm, it is not advisable. Since both are supposed to headspace on the case head, the .40, being shorter, will be held in place by the extractor. Never a recipe for reliable function.
Fire only the ammunition your firearm was designed to fire.
I have shot 40 S&W ammo in my Glock 20SF twice, once on purpose and once by acident. The 40 S&W ammo worked in the 10mm mag and fired just fine both times. Since they were my reloads they felt a little less powerful than the 10mm reloads but not bad and were accurate.
I would not suggest for everyday use.![]()