just picked up the mossberg 500. i dont know that much regarding guns. just wondering whats the difference with the chokes and which ones i should use. it came with a full, improved, and modified. my uncles got me an 870 a couple years ago when i graduated highschool. it only came with one choke and i have used that to kill deer, pheasants, squirrels, and shoot skeet. i just want to know what each choke does and what it would be good for.