What do you use? I grew up pickin the heads off with a Cooey ranger (.22 LR). Times change and I have tried 4/10's, 20's and 12's. I have been looking hard at a 20 guage o/u (something cheap like a mossberg silver reserve), but cant justify the cost when my mariner 500 does the same job. So all you hard core grousers, what is your choice aff gun and guage, or are you a rimfire type? P.S, I shoot them on the ground or in the air, I dont care if they're on the wing!