Learn to reload a pump, and shoot better. But yeah the detachable mag shotguns either don't hold as much as you think or have a really bulky mag, and depending on the aggression of the gators either one shot will scare them off or you need a rifle that is easy to control, lethal at close ranges, and has the ability to reload easily and quickly (i.e. an AR) if you're set on a shotgun I'd recommend tube fed and if you need an autoloader then the stoegers are pretty good, and relatively cheap.