We shot 15 last year, 7 in one day, we did have one that took a couple of weeks. Since the ponds are on the river,they just keep coming in. Travis' dad caught 6 and there was fresh sign out Sun. It is an ongoing fight with them but we haven't seen or trapped a rat in 3 years. They are easier to kill at daybreak. 260 or 7mm/08 is perfect.
