It's difficult to answer. As far as I know, every American gun manufacturer makes numerous models in .40 and almost every other manufacturer does also.
There is no specific number available for the total production of the 40 caliber mk 4 series 80 government models. Production numbers for firearms can vary widely and may not be publicly disclosed by manufacturers.
The correct term is cartridge, not bullet- and the answer will depend on WHICH .40 caliber pistol.
The .40 caliber fires a larger, more powerful cartridge than the 9mm. which is about .35 caliber. Minor additional info: Many models of pistols that are available in 9mm or .40 are otherwise the same, except for caliber. For instance, a Glock 19 and a Glock 23 are the same exact guns, but the 19 is a 9mm and the 23 is a 40...the 23 holds 2 less rounds.
The most common in the U.S. I believe is the Glock 23, but Sigs, and other models are common also.
No
the 40 cal is a little bigger then the 357
No, you cannot safely shoot a .45 caliber bullet from a .40 caliber handgun. The .40 caliber handgun is designed specifically for .40 S&W ammunition, which has a different casing size and bullet diameter compared to the .45 caliber. Attempting to use .45 caliber ammunition in a .40 caliber firearm could lead to dangerous malfunctions or serious injury. Always use the correct ammunition specified for your handgun.
40
40
"My pistol is .40 caliber." "We were fortunate to find a manager of his caliber."
Yes, a 45 caliber bullet is bigger than a 40 caliber bullet. A .45 is0.45 inches wide in diameter and a .40 is 0.4 inches in diameter.
@ .05 inches