Like Ready_fire_aim, I would suggest the old #4. They are big enough that you need to do some damage to take one out.
The law in Oklahoma generally has exceptions for killing otherwise protected animals if you’re defending livestock.So if they are bothering your livestock, your screwed or breaking the law and killing them?
Yes they're protected but wildlife department will give cattle producers a depradation permit to take 10Federally protected, keep that in mind. As far as the loads, #4 and #6 in either 2 3/4 or 3" should do. The long barrel length increasing range and pattern was disproven years ago.
Enter your email address to join: