I have a rat living in the flower beds beside the house. The flower beds are covered in river rock and big iron ore boulders. I've seen this rat three times this week. If I shoot him with .357 shot shells, CCI, which I have, is there any danger of the shot bouncing off the river rock? And FYI, I hate rats. My options are 12 ga, 20 ga, .410, and .357 shot shells.