(quoted from post at 21:30:09 03/08/15)
(quoted from post at 10:59:25 03/08/15) For a shotgun, 12 gauge light field load shells seem to be less expensive than any of the smaller gauge shells. .22 ammo is still less expensive than any shotgun shell. Look into shotgun chokes and pellet sizes to adjust a shotgun to the range and type of animal you are shooting.
If you are concerned about your chickens eating lead shot and contaminating their meat and eggs, use steel shot or some other non-lead shot for water fowl (high cost).
Jay, have you identified the predators that are attacking your chickens?
The predators and your location will influence what gun to use. If you are in an dense urban area, trapping the predators or improving your fences could be the best solution.
Im shocked (but really shouldnt be) that with all the replies, this is the only one with the correct answer.... TRAPS.
Traps work 24/7/365, no matter what gun a person has you can never equal that. Not to mention, those animals are smart, they learn real quick when a person is home and what happens when they have a "boom stick" in hand.
Coons. Easy to shoot, can be dumb and bold or sneaky as all get out. Dumb and bold is easy but you still lose a few chickens till you get on the problem. Get a sneaky one or one you "educated" by missing or something, those are tough to get. Traps work well though because dumb or smart, coons rarely will pass up a free meal. Throw out some bait, dog biscut, empty tuna can or marshmellows. After a few days the coon cant wait to get back to the free buffet, thats when you put out the trap. You will get him first night, maybe second. Google "Duke no dog" traps and "conibear bucket set" or even "havaheart live trap".
Fox. You can shoot the first one, maybe the second but after that, you got a tough row to hoe because they are smart buggers and you just tought them what happens to their buddies when they see you and a gun. Its unlikely you will see them again. Learn to set a leg hold trap and let it hunt for you. Google a "hay set" and a "hay bale set", both have worked well for me. If you have something digging into your pen, keep the hole they started and put a trap in it (no bait) and just leave it, something will try digging again and get caught.
Coyote. The conventional wisdom is you either have coyotes or you have fox, not both and for me thats pretty true. Coyotes eat the same food and drive out the fox (some say even eat the fox). I have seen both around but not as a rule. Because of that, I dont have much experience with coyotes but I do know the hunters are always looking for new land to shoot them. Give em permission and let them take care of the problem, they usually come around a couple times a year. Make it clear though, you want them all gone and thats conditional on them hunting otherwise they tend to have a little self control by not shooting them all so they can hunt year after year. Of you could learn to trap them.
If you insist on a gun to solve your problems, you will be back here next year with the same problem. If thats the case, get the gun that will give you the highest chances of success, 12 gauge shotgun. There is no way a person unfamiliar with guns can shoot a .22 as well as a shotgun. And why would a person get a lesser gun like a 410 when a 12 gauge can shoot light loads that equal a 410 but a 410 can never shoot equal loads as a 12 gauge? Makes no sense... get the 12 gauge. But remember that traps are the real answer.