I'll use what I've got in my hand at the time but my choice is a .410 with No. 5 shot in a 3 inch shell. Hold high and the breasts take very few pellets. Knocks 'em over real good. I usually have my .410 broken open sitting wedged between the seat and consol of the truck when I'm heading down and FSR. Easier and faster to load up than my .22 as well.