Old #7
When I was into semi-automatic firearms, rifles and pistols, I had the same problem with brass flying around. I developed a neat way to police this. Eventually you will see a pattern to the way your rifle ejects shells. Unless you drastically change loads, or point of aim, a specific rifle will usually toss them toward a specific point on the ground, usually they will all land in about a 12-18 inch diamter circle. locate the center of that "circle" then take a 12-18" cardboard box, pack the bottom with shop rags, etc.. and put it on the ground. Now you have a neat little shell catcher, that you spent no money on. 
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Safety,Ethics, Accuracy, Velocity, Energy-I am On the Way to the Arizona Predator Hunt!!!!!!