Now I was having second thoughts, conflicting pros and cons about the 9 and the 40 then I realized I can use +P and +P+ and increase my chance of SD. Am I correct about that? Higher pressure means more velocity/energy, right?
Now I was having second thoughts, conflicting pros and cons about the 9 and the 40 then I realized I can use +P and +P+ and increase my chance of SD. Am I correct about that? Higher pressure means more velocity/energy, right?
Thanks again. Yes, I'm having practice at the range and having a 9mm made it more affordable. I have probably somewhere over 300 rounds through my Sigma 9 and I'm getting better with my shot placements at 21 feet. I had 2 mags (30 rnds) in the chest, 2 mags in the torso and 2 mags in the head. The target's not even life sized so I feel pretty good. Of course there's some misses but only a few so I'd say over 90% hits
Get accurate with the gun and then seek out some training classes. Learning how to manipulate and "operate" the gun is just as important as being accurate. A good dynamic handgun class will do you some good.
You are missing basic physics. It isn't pressure that propels a bullet and generates energy, it's force. Pressure is measured and expressed in pounds per square inch. That's what "psi" stands for. Irrespective of weight, a .40 caliber bullet has a larger base for the pressure to act on.Oysterboy said:As I was browsing around on calibers I came across the chamber pressure chart. It showed that the .40 and the 9mm (both standard) showed 35K psi. I know that the .40 bullet, say 165, is heavier compared to 9mm bullet, say 147, but as I learned the heavier the bullet the lower the velocity thus less energy.
Yet I've seen charts that showed the .40 expends more energy than the 9mm. I'm missing something here, what is it?
As I was browsing around on calibers I came across the chamber pressure chart. It showed that the .40 and the 9mm (both standard) showed 35K psi. I know that the .40 bullet, say 165, is heavier compared to 9mm bullet, say 147, but as I learned the heavier the bullet the lower the velocity thus less energy.
Yet I've seen charts that showed the .40 expends more energy than the 9mm. I'm missing something here, what is it?
The 40 definitely has a slight edge of power over the 9mm, but I would not lose any sleep over it.