The cone is the way to go, and use a machete (about $12 at TSC) if you're worried about your aim.
Here's the thing about bullets - regardless of how good your aim is, a chicken isn't going to stop one. When you watch an action movie, the hero has never dove behind a chicken like "Whew!! That was close!" Even if you're a sharpshooter and hit that dime-sized brain Every Single Time, that bullet will just keep right on going.
Well sure, I can hear y'all scoff, Chickens are short, I'll be aiming down.
Whatever dude, it's your funeral - or, really, your kids or dogs funeral. Although I have a cousin-in-law who lost an eye because he thought it wasn't true that bullets can ricochet.
It is true, and it must be true there's an angel that watches over fools, because one degree change in angle and that bullet would have killed him.
Now, it must be pointed out, I have a gun, I use a gun, and I have used a gun to put down animals (although not chickens!). So it's not that I'm against them. But you MUST know - not think, not guess, not assume - where that bullet will end and everything that is around, behind and near your target