Can I use 10mm bullets in my .40 S&W? Can I use 10mm bullets in my .40 S&W? September 5, 2019 Michelle Gallagher Yes. The 10mm Auto and the .40 S&W use exactly the same bullet diameter. 2 Newer Does my 9mm Makarov use the same bullets as a regular 9mm Luger? I recently purchased a Makarov, but on attempting to load it, found that my reloading dies weren’t sizing the cases down far enough to hold standard 9mm bullets. View all posts Older What advantage is there in using carbide pistol dies?