You'll run out of arrows, bullets and what ever else you own in your arsenal before you can kill all of those corn rats.

I chased a group of 17 off last year and 3 big ones wouldn't leave. They'd just strare me down and click their teeth at me[]. I'd rush them and they'd back up a bit, but weren't going anywhere far. Soon afterwards they scattered hard and I thought finally they are gone, but only to see two whopper Rusian boars come over the hill. NOT big bucks[:'(].