I got a 13 ounce, 357 Magnum j-frame on my 21st birthday. The recoil is blood-inducing and now I know that the short barrel limits the performance and increases the flash, bang, and recoil. I shot a full-size 9mm XD-M a few times last year and I always wanted one and now I can afford one. Now I'm divided as to whether I should get the 9mm or 40SW. From my understanding premium JHP's form both loads will do their job as long as I do mine (shot placement). Nevertheless, I've also read in many documents that the 40SW still has a slight performance edge for defense. I'm set on Cor-Bon Self-Defense JHP bullets either way (from my present understanding). The shooting range doesn't rent firearms anymore. How much greater is the recoil of the 40SW than the 9mm? The baseline for comparison is: Caliber: 9mm +P Bullet Wt.: 115gr Velocity: 1350fps Energy: 466ftlbs Compared to: Caliber: 40 S&W Bullet Wt.: 135gr Velocity: 1325fps Energy: 526ftlbs and Caliber: 40 S&W Bullet Wt.: 150gr Velocity: 1200fps Energy: 480ftlbs You can probably infer from this that high-capacity and supersonic speeds are important factors in my consumer choices.