Absolutely NOT! 9mm and 40 cal are completely different sizes and would not properly feed and cause an obstruction. What can be done on some handguns is swap out the 40 cal barrel for a 9mm barrel. If you can use this method, you may need 9mm magazines.
Is a 40 more powerful than a 9mm?
40 S&W has more energy, delivering superior ballistics to the target which results in larger, more lethal wounds to a threat. (This is not at all to say that the 9mm is a weak cartridge.) For this reason, many people who want more power prefer the . 40 S&W over the 9mm Luger.18 Dec 2019
Is 9mm or 40 better for concealed carry?
Yes, this is a massive generalization, but the fact remains that 9mm is a far more effective round than it used to be. 9mm is also far less snappy than . 40 and carries 1-3 more rounds on average. As a result, police departments and the FBI have essentially migrated from the 9mm to the .30 Aug 2020
Can you shoot 10mm in a 40 cal?
Absolutely! The . 40 S&W is identical to the 10mm save for length.
Is 10mm and .40 cal the same?
Both bullets are the same diameter. 40 Caliber is usually synonymous with . 40 S&W, which, while the same diameter as 10mm, is shorter: it can fit into 9mm sized handguns.