My question is how effective is premium self defense cartridges such as Ranger T, HST, Gold Dot's both standard pressure and +P out of short barrels? When I say short barrel, I'm asking in particularly about the G30/36 3.78inch barrel. The question I'm really getting at is, what is the minimum muzzle FPS that a .45 SD JHP would have to be traveling to be effective? 800FPS? 850? 750? And how much velocity does a shorter barrel bleed off for a .45ACP?