Hello folks. I have been using 5.8gr of Unique for my Hornady 230gr ACP for my defensive loads for my Taurus PT1911 and Sig P220. I just purchased a Glock 36 which will be my carry weapon. Is it true that that either a 180gr or 200gr bullet should be more appropriate for a smaller handgun/shorter barrel? If so, what should be the average fps of the bullet to make it a sufficient self defense round? Thanks for your answers.