The Mossberg rifles, I've heard nothing but good about!
Alot of people discount them because they arent as fancy or dont have high end features... I still want one and our local WalMart always has them for very reasonable prices!
Only thing I dont like is lack of irons on them. All are scope mount ready with no back up.
Snares are a good idea especially if anyone else is close. We've used traps like what Oli posted, and had an animal run off with one trap and one "ran off" less one leg. Theyre helpful if you have them and you can often find them at flea markets or auctions. I think the ones my in laws have all came from auction.
One being that close is bad news, and yeah I think "yote wars" is appropriate here. It tough when where we live overlaps where they live. But lets face it, they dont have thumbs or firearms, so they have to go, they get evicted.
A coyote that doesnt fear humans anymore, and worse, an entire pack that has grown and learned to not fear humans is all bad. I dont know what your winters are like, but when food gets scarce, they'll be closer still. Maybe just your garbage, maybe neighbor pets, or another young cow. But what happens when you make provision to cut all that off and deny them accesss?
I dont wanna be all "the sky is falling" but look ahead. Theyre smart, but predictable.