Hi I am new to the hunting scene.This was my first year deer hunting. Since I have a limited budget, I purchased a 20 ***** Remington 870, which came with a slug barrel and a shot barrel. The 20 ***** was chosen so my wife could use it without dislocating her shoulder.My friends are deer hunters, but I thought I would try my hand at small game.My question is what size shot is good for the little guys when using 20 *****.thanks