on this horse breeding farm i used to work on, they had a huge huge rat problem. the mexicans were horrible about leaving stuff out for them,, feeding the cat so it would not hunt.. some of those rats were huge huge.. and quite fearless. i used a cheap chinese 177 ... with the rapter gold pellets.. fast fliers for sure... you had to hit them in the head or neck.. body shots would only allow them to crawl back in the hole.. my fave tactic was to set up,, let one get in the middle of of the hall or stall,, ace em in the spine, and let em kick around a while.. sooner or later one of his rat *censored* buddies would come to nibble on him and try to eat em.. then i would ace him.. most i got from one set up like this was four.. pretty nice.. *censored*s, cannibals, showing no loyalty to their own kind...some of those rats were real booners. big old grain fed rats.