9x19 runs very close to identical pressures as 40. In fact, overal demension changes in 9x19(deep seated bullets) are FAR more dangerous due to the small case size of 9mm. I belive I read of a test where pressures in 9 were raised from roughly 30,000 to 60,000 psi by seating the bullet 1/32" deeper in the case. Not good to say the least.Originally posted by GUNNER:
I have no doubts in our Late Great John Moses Brownings' designs, though I'm inclined to wonder what He would have to say about such a high pressure round (.40 S&W) being fired from a gun designed for a 9mm. Correctly loaded, .40 rounds may run flawlessly. I'd worry alot about deeply seated bullets in this configuration.